diff --git a/Software/PC_Application/Traces/Marker/marker.cpp b/Software/PC_Application/Traces/Marker/marker.cpp
index a25a1b8..0830a17 100644
--- a/Software/PC_Application/Traces/Marker/marker.cpp
+++ b/Software/PC_Application/Traces/Marker/marker.cpp
@@ -684,18 +684,51 @@ void Marker::traceDataChanged()
 void Marker::updateSymbol()
 {
     if(isDisplayedMarker()) {
-        constexpr int width = 15, height = 15;
-        symbol = QPixmap(width, height);
-        symbol.fill(Qt::transparent);
-        QPainter p(&symbol);
-        p.setRenderHint(QPainter::Antialiasing);
-        QPointF points[] = {QPointF(0,0),QPointF(width,0),QPointF(width/2,height)};
-        auto traceColor = parentTrace->color();
-        p.setPen(traceColor);
-        p.setBrush(traceColor);
-        p.drawConvexPolygon(points, 3);
-        p.setPen(Util::getFontColorFromBackground(traceColor));
-        p.drawText(QRectF(0,0,width, height*2.0/3.0), Qt::AlignCenter, QString::number(number) + suffix);
+        auto style = Preferences::getInstance().Marker.symbolStyle;
+        switch(style) {
+        case MarkerSymbolStyle::FilledNumberInside: {
+            constexpr int width = 15, height = 15;
+            symbol = QPixmap(width, height);
+            symbol.fill(Qt::transparent);
+            QPainter p(&symbol);
+            p.setRenderHint(QPainter::Antialiasing);
+            QPointF points[] = {QPointF(0,0),QPointF(width,0),QPointF(width/2,height)};
+            auto traceColor = parentTrace->color();
+            p.setPen(traceColor);
+            p.setBrush(traceColor);
+            p.drawConvexPolygon(points, 3);
+            p.setPen(Util::getFontColorFromBackground(traceColor));
+            p.drawText(QRectF(0,0,width, height * 2.0 / 3.0), Qt::AlignCenter, QString::number(number) + suffix);
+        }
+            break;
+        case MarkerSymbolStyle::FilledNumberAbove: {
+            constexpr int width = 15, height = 30;
+            symbol = QPixmap(width, height);
+            symbol.fill(Qt::transparent);
+            QPainter p(&symbol);
+            p.setRenderHint(QPainter::Antialiasing);
+            QPointF points[] = {QPointF(0,height/2),QPointF(width,height/2),QPointF(width/2,height)};
+            auto traceColor = parentTrace->color();
+            p.setPen(traceColor);
+            p.setBrush(traceColor);
+            p.drawConvexPolygon(points, 3);
+            p.drawText(QRectF(0,0,width, height * 0.45), Qt::AlignCenter, QString::number(number) + suffix);
+        }
+            break;
+        case MarkerSymbolStyle::EmptyNumberAbove: {
+            constexpr int width = 15, height = 30;
+            symbol = QPixmap(width, height);
+            symbol.fill(Qt::transparent);
+            QPainter p(&symbol);
+            p.setRenderHint(QPainter::Antialiasing);
+            QPointF points[] = {QPointF(0,height/2),QPointF(width,height/2),QPointF(width/2,height)};
+            auto traceColor = parentTrace->color();
+            p.setPen(traceColor);
+            p.drawConvexPolygon(points, 3);
+            p.drawText(QRectF(0,0,width, height * 0.45), Qt::AlignCenter, QString::number(number) + suffix);
+        }
+            break;
+        }
     } else {
         symbol = QPixmap(1,1);
     }
diff --git a/Software/PC_Application/VNA/Deembedding/impedancerenormalization.cpp b/Software/PC_Application/VNA/Deembedding/impedancerenormalization.cpp
index 4bcea37..201d40b 100644
--- a/Software/PC_Application/VNA/Deembedding/impedancerenormalization.cpp
+++ b/Software/PC_Application/VNA/Deembedding/impedancerenormalization.cpp
@@ -17,8 +17,34 @@ ImpedanceRenormalization::ImpedanceRenormalization()
 
 void ImpedanceRenormalization::transformDatapoint(VirtualDevice::VNAMeasurement &p)
 {
-    //p.S = Sparam(ABCDparam(p.S, p.Z0), impedance);
-    // TODO
+    std::map<QString, std::complex<double>> transformed;
+    int ports = 0;
+    QString name = "S11";
+    while(p.measurements.count(name) > 0) {
+        ports++;
+        name = "S"+QString::number(ports+1)+QString::number(ports+1);
+    }
+    for(auto i=1;i<=ports;i++) {
+        auto S11name = "S"+QString::number(i)+QString::number(i);
+        auto S11 = p.measurements[S11name];
+        transformed[S11name] = Sparam(ABCDparam(Sparam(S11, 0.0, 0.0, 1.0), p.Z0), impedance).m11;
+        for(auto j=i+1;j<=ports;j++) {
+                auto S12name = "S"+QString::number(i)+QString::number(j);
+                auto S21name = "S"+QString::number(j)+QString::number(i);
+                auto S22name = "S"+QString::number(j)+QString::number(j);
+                if(!p.measurements.count(S12name) || !p.measurements.count(S21name) || !p.measurements.count(S22name)) {
+                    // not all measurements available, skip this
+                    continue;
+                }
+                auto S12 = p.measurements[S12name];
+                auto S21 = p.measurements[S21name];
+                auto S22 = p.measurements[S22name];
+            auto S_t = Sparam(ABCDparam(Sparam(S11, S12, S21, S22), p.Z0), impedance);
+            transformed[S12name] = S_t.m12;
+            transformed[S21name] = S_t.m21;
+        }
+    }
+    p.measurements = transformed;
     p.Z0 = impedance;
 }
 
diff --git a/Software/PC_Application/VNA/Deembedding/matchingnetwork.cpp b/Software/PC_Application/VNA/Deembedding/matchingnetwork.cpp
index 9521f10..5e425f2 100644
--- a/Software/PC_Application/VNA/Deembedding/matchingnetwork.cpp
+++ b/Software/PC_Application/VNA/Deembedding/matchingnetwork.cpp
@@ -24,6 +24,7 @@ MatchingNetwork::MatchingNetwork()
     dragComponent = nullptr;
     dropComponent = nullptr;
     addNetwork = true;
+    port = 1;
 }
 
 void MatchingNetwork::transformDatapoint(VirtualDevice::VNAMeasurement &p)
@@ -34,26 +35,40 @@ void MatchingNetwork::transformDatapoint(VirtualDevice::VNAMeasurement &p)
         // this point is not calculated yet
         MatchingPoint m;
         // start with identiy matrix
-        m.p1 = ABCDparam(1.0,0.0,0.0,1.0);
-        for(auto c : p1Network) {
-            m.p1 = m.p1 * c->parameters(p.frequency);
-        }
-        // same for network at port 2
-        m.p2 = ABCDparam(1.0,0.0,0.0,1.0);
-        for(auto c : p2Network) {
-            m.p2 = m.p2 * c->parameters(p.frequency);
+        m.p = ABCDparam(1.0,0.0,0.0,1.0);
+        for(auto c : network) {
+            m.p = m.p * c->parameters(p.frequency);
         }
         if(!addNetwork) {
-            // need to remove the effect of the networks, invert matrices
-            m.p1 = m.p1.inverse();
-            m.p2 = m.p2.inverse();
+            // need to remove the effect of the network, invert matrix
+            m.p = m.p.inverse();
         }
         matching[p.frequency] = m;
     }
     // at this point the map contains the matching network effect
     auto m = matching[p.frequency];
-    auto corrected = m.p1 * measurement * m.p2;
-    p.fromSparam(Sparam(corrected, p.Z0), 1, 2);
+    VirtualDevice::VNAMeasurement uncorrected = p;
+    // correct reflection measurement (in case no two-port measurement is complete
+    QString name = "S"+QString::number(port)+QString::number(port);
+    if(uncorrected.measurements.count(name) > 0) {
+        auto S = Sparam(uncorrected.measurements[name], 0.0, 0.0, 1.0);
+        auto corrected = Sparam(m.p * ABCDparam(S, p.Z0), p.Z0);
+        p.measurements[name] = corrected.m11;
+    }
+    // handle the rest of the measurements
+    for(int i=0;i<VirtualDevice::getInfo(VirtualDevice::getConnected()).ports;i++) {
+        for(int j=i+1;j<VirtualDevice::getInfo(VirtualDevice::getConnected()).ports;j++) {
+            if(i == port) {
+                auto S = uncorrected.toSparam(i, j);
+                auto corrected = Sparam(m.p * ABCDparam(S, p.Z0), p.Z0);
+                p.fromSparam(corrected, i, j);
+            } else if(j == port) {
+                auto S = uncorrected.toSparam(i, j);
+                auto corrected = Sparam(ABCDparam(S, p.Z0) * m.p, p.Z0);
+                p.fromSparam(corrected, i, j);
+            }
+        }
+    }
 }
 
 void MatchingNetwork::edit()
@@ -80,6 +95,10 @@ void MatchingNetwork::edit()
     ui->lParallelL->installEventFilter(this);
     ui->lParallelR->installEventFilter(this);
     ui->lDefinedThrough->installEventFilter(this);
+
+    ui->port->setValue(port);
+    ui->port->setMaximum(VirtualDevice::getInfo(VirtualDevice::getConnected()).ports);
+
     layout->setContentsMargins(0,0,0,0);
     layout->setSpacing(0);
     layout->addStretch(1);
@@ -93,26 +112,15 @@ void MatchingNetwork::edit()
     DUT->setMaximumSize(DUTWidth, 151);
     DUT->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
     DUT->setStyleSheet("image: url(:/icons/DUT.png);");
-    auto p2 = new QWidget();
-    p2->setMinimumSize(portWidth, 151);
-    p2->setMaximumSize(portWidth, 151);
-    p2->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
-    p2->setStyleSheet("image: url(:/icons/port2.png);");
+
     layout->addWidget(p1);
-    for(auto w : p1Network) {
+    for(auto w : network) {
         layout->addWidget(w);
         connect(w, &MatchingComponent::MatchingComponent::valueChanged, [=](){
            matching.clear();
         });
     }
     layout->addWidget(DUT);
-    for(auto w : p2Network) {
-        layout->addWidget(w);
-        connect(w, &MatchingComponent::MatchingComponent::valueChanged, [=](){
-           matching.clear();
-        });
-    }
-    layout->addWidget(p2);
 
     layout->addStretch(1);
 
@@ -129,37 +137,34 @@ void MatchingNetwork::edit()
         // network changed, need to recalculate matching
         matching.clear();
     });
+    connect(ui->port, qOverload<int>(&QSpinBox::valueChanged), [=](){
+        port = ui->port->value();
+    });
     connect(ui->buttonBox, &QDialogButtonBox::accepted, dialog, &QDialog::accept);
 }
 
 nlohmann::json MatchingNetwork::toJSON()
 {
     nlohmann::json j;
-    nlohmann::json jn1, jn2;
-    for(auto c : p1Network) {
+    nlohmann::json jn;
+    for(auto c : network) {
         nlohmann::json jc;
         jc["component"] = c->getName().toStdString();
         jc["params"] = c->toJSON();
-        jn1.push_back(jc);
+        jn.push_back(jc);
     }
-    for(auto c : p2Network) {
-        nlohmann::json jc;
-        jc["component"] = c->getName().toStdString();
-        jc["params"] = c->toJSON();
-        jn2.push_back(jc);
-    }
-    j["port1"] = jn1;
-    j["port2"] = jn2;
+    j["port"] = port;
+    j["network"] = jn;
     j["addNetwork"] = addNetwork;
     return j;
 }
 
 void MatchingNetwork::fromJSON(nlohmann::json j)
 {
-    p1Network.clear();
-    p2Network.clear();
-    if(j.contains("port1")) {
-        for(auto jc : j["port1"]) {
+    network.clear();
+    port = j.value("port", 1);
+    if(j.contains("network")) {
+        for(auto jc : j["network"]) {
             if(!jc.contains("component")) {
                 continue;
             }
@@ -168,20 +173,7 @@ void MatchingNetwork::fromJSON(nlohmann::json j)
                 continue;
             }
             c->fromJSON(jc["params"]);
-            p1Network.push_back(c);
-        }
-    }
-    if(j.contains("port2")) {
-        for(auto jc : j["port2"]) {
-            if(!jc.contains("component")) {
-                continue;
-            }
-            auto c = MatchingComponent::createFromName(QString::fromStdString(jc["component"]));
-            if(!c) {
-                continue;
-            }
-            c->fromJSON(jc["params"]);
-            p2Network.push_back(c);
+            network.push_back(c);
         }
     }
     addNetwork = j.value("addNetwork", true);
@@ -192,15 +184,9 @@ MatchingComponent *MatchingNetwork::componentAtPosition(int pos)
 {
     pos -= graph->layout()->itemAt(0)->geometry().width();
     pos -= portWidth;
-    if(pos > 0 && pos <= (int) p1Network.size() * componentWidth) {
+    if(pos > 0 && pos <= (int) network.size() * componentWidth) {
         // position is in port 1 network
-        return p1Network[pos / componentWidth];
-    } else if(pos > (int) p1Network.size() * componentWidth + DUTWidth) {
-        pos -= (int) p1Network.size() * componentWidth + DUTWidth;
-        if(pos <= (int) p2Network.size() * componentWidth) {
-                // position is in port 2 network
-                return p2Network[pos / componentWidth];
-        }
+        return network[pos / componentWidth];
     }
     return nullptr;
 }
@@ -209,28 +195,15 @@ unsigned int MatchingNetwork::findInsertPosition(int xcoord)
 {
     xcoord -= graph->layout()->itemAt(0)->geometry().width();
     xcoord -= portWidth;
-    if(xcoord <= (int) p1Network.size() * componentWidth + DUTWidth/2) {
-        // added in port 1 network
-        int index = (xcoord + componentWidth / 2) / componentWidth;
-        if(index < 0) {
-            index = 0;
-        } else if(index > (int) p1Network.size()) {
-            index = p1Network.size();
-        }
-        // add 2 (first two widgets are always the stretch and port 1 widget)
-        return index + 2;
-    } else {
-        // added in port 2 network
-        xcoord -= (int) p1Network.size() * componentWidth + DUTWidth;
-        int index = (xcoord + componentWidth / 2) / componentWidth;
-        if(index < 0) {
-            index = 0;
-        } else if(index > (int) p2Network.size()) {
-            index = p2Network.size();
-        }
-        // add 3 (same two widgets as in port 1 + DUT) and the size of the port 1 network
-        return index + 3 + p1Network.size();
+    // added in port 1 network
+    int index = (xcoord + componentWidth / 2) / componentWidth;
+    if(index < 0) {
+        index = 0;
+    } else if(index > (int) network.size()) {
+        index = network.size();
     }
+    // add 2 (first two widgets are always the stretch and port 1 widget)
+    return index + 2;
 }
 
 void MatchingNetwork::addComponentAtPosition(int pos, MatchingComponent *c)
@@ -242,12 +215,7 @@ void MatchingNetwork::addComponentAtPosition(int pos, MatchingComponent *c)
 
     // add component to correct matching network
     index -= 2; // first two widgets are fixed
-    if(index <= p1Network.size()) {
-        addComponent(true, index, c);
-    } else {
-        index -= 1 + p1Network.size();
-        addComponent(false, index, c);
-    }
+    addComponent(index, c);
 
     // network changed, need to recalculate matching
     matching.clear();
@@ -256,22 +224,13 @@ void MatchingNetwork::addComponentAtPosition(int pos, MatchingComponent *c)
     });
 }
 
-void MatchingNetwork::addComponent(bool port1, int index, MatchingComponent *c)
+void MatchingNetwork::addComponent(int index, MatchingComponent *c)
 {
-    if(port1) {
-        p1Network.insert(p1Network.begin() + index, c);
-        // remove from list when the component deletes itself
-        connect(c, &MatchingComponent::deleted, [=](){
-             p1Network.erase(remove(p1Network.begin(), p1Network.end(), c), p1Network.end());
-        });
-    } else {
-        // same procedure for port 2 network
-        p2Network.insert(p2Network.begin() + index, c);
-        // remove from list when the component deletes itself
-        connect(c, &MatchingComponent::deleted, [=](){
-             p2Network.erase(remove(p2Network.begin(), p2Network.end(), c), p2Network.end());
-        });
-    }
+    network.insert(network.begin() + index, c);
+    // remove from list when the component deletes itself
+    connect(c, &MatchingComponent::deleted, [=](){
+         network.erase(remove(network.begin(), network.end(), c), network.end());
+    });
 }
 
 void MatchingNetwork::createDragComponent(MatchingComponent *c)
@@ -326,8 +285,7 @@ bool MatchingNetwork::eventFilter(QObject *object, QEvent *event)
             // remove and hide component while it is being dragged
             graph->layout()->removeWidget(dragComponent);
             dragComponent->hide();
-            p1Network.erase(remove(p1Network.begin(), p1Network.end(), dragComponent), p1Network.end());
-            p2Network.erase(remove(p2Network.begin(), p2Network.end(), dragComponent), p2Network.end());
+            network.erase(remove(network.begin(), network.end(), dragComponent), network.end());
             graph->update();
 
             // network changed, need to recalculate matching
diff --git a/Software/PC_Application/VNA/Deembedding/matchingnetwork.h b/Software/PC_Application/VNA/Deembedding/matchingnetwork.h
index e881a76..314a4f9 100644
--- a/Software/PC_Application/VNA/Deembedding/matchingnetwork.h
+++ b/Software/PC_Application/VNA/Deembedding/matchingnetwork.h
@@ -77,11 +77,13 @@ private:
     MatchingComponent *componentAtPosition(int pos);
     unsigned int findInsertPosition(int xcoord);
     void addComponentAtPosition(int pos, MatchingComponent *c);
-    void addComponent(bool port1, int index, MatchingComponent *c);
+    void addComponent(int index, MatchingComponent *c);
     void createDragComponent(MatchingComponent *c);
     void updateInsertIndicator(int xcoord);
     bool eventFilter(QObject *object, QEvent *event) override;
-    std::vector<MatchingComponent*> p1Network, p2Network;
+
+    std::vector<MatchingComponent*> network;
+    int port;
 
     QWidget *graph, *insertIndicator;
     QPoint dragStartPosition;
@@ -91,7 +93,7 @@ private:
 
     class MatchingPoint {
     public:
-        ABCDparam p1, p2;
+        ABCDparam p;
     };
     std::map<double, MatchingPoint> matching;
 
diff --git a/Software/PC_Application/VNA/Deembedding/matchingnetworkdialog.ui b/Software/PC_Application/VNA/Deembedding/matchingnetworkdialog.ui
index a1c67f3..5b9a10a 100644
--- a/Software/PC_Application/VNA/Deembedding/matchingnetworkdialog.ui
+++ b/Software/PC_Application/VNA/Deembedding/matchingnetworkdialog.ui
@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>772</width>
-    <height>443</height>
+    <width>913</width>
+    <height>633</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -21,6 +21,37 @@
 </string>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout_9">
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout_2">
+     <item>
+      <widget class="QLabel" name="label_3">
+       <property name="text">
+        <string>Port:</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QSpinBox" name="port">
+       <property name="minimum">
+        <number>1</number>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <spacer name="horizontalSpacer">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>40</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+    </layout>
+   </item>
    <item>
     <layout class="QVBoxLayout" name="verticalLayout_8">
      <item>
@@ -48,7 +79,7 @@
          <rect>
           <x>0</x>
           <y>0</y>
-          <width>750</width>
+          <width>891</width>
           <height>168</height>
          </rect>
         </property>
diff --git a/Software/PC_Application/VNA/Deembedding/portextension.cpp b/Software/PC_Application/VNA/Deembedding/portextension.cpp
index edcf601..0b0e2a8 100644
--- a/Software/PC_Application/VNA/Deembedding/portextension.cpp
+++ b/Software/PC_Application/VNA/Deembedding/portextension.cpp
@@ -13,50 +13,35 @@ using namespace std;
 PortExtension::PortExtension()
     : DeembeddingOption()
 {
-    port1.enabled = false;
-    port1.frequency = 0;
-    port1.loss = 0;
-    port1.DCloss = 0;
-    port1.delay = 0;
-    port1.velocityFactor = 0.66;
-    port2.enabled = false;
-    port2.frequency = 0;
-    port2.loss = 0;
-    port2.DCloss = 0;
-    port2.delay = 0;
-    port2.velocityFactor = 0.66;
+    ext.frequency = 0;
+    ext.loss = 0;
+    ext.DCloss = 0;
+    ext.delay = 0;
+    ext.velocityFactor = 0.66;
+
+    port = 1;
 
     kit = nullptr;
 }
 
 void PortExtension::transformDatapoint(VirtualDevice::VNAMeasurement &d)
 {
-    if(port1.enabled || port2.enabled) {
-        if(port1.enabled) {
-            auto phase = -2 * M_PI * port1.delay * d.frequency;
-            auto db_attennuation = port1.DCloss;
-            if(port1.frequency != 0) {
-                db_attennuation += port1.loss * sqrt(d.frequency / port1.frequency);
-            }
-            // convert from db to factor
-            auto att = pow(10.0, -db_attennuation / 20.0);
-            auto correction = polar<double>(att, phase);
-            d.measurements["S11"] /= correction * correction;
-            d.measurements["S21"] /= correction;
-            d.measurements["S12"] /= correction;
+    auto phase = -2 * M_PI * ext.delay * d.frequency;
+    auto db_attennuation = ext.DCloss;
+    if(ext.frequency != 0) {
+        db_attennuation += ext.loss * sqrt(d.frequency / ext.frequency);
+    }
+    // convert from db to factor
+    auto att = pow(10.0, -db_attennuation / 20.0);
+    auto correction = polar<double>(att, phase);
+    for(auto &m : d.measurements) {
+        if(m.first.mid(1, 1).toInt() == port) {
+            // selected port is the destination of this S parameter
+            m.second /= correction;
         }
-        if(port2.enabled) {
-            auto phase = -2 * M_PI * port2.delay * d.frequency;
-            auto db_attennuation = port2.DCloss;
-            if(port2.frequency != 0) {
-                db_attennuation += port2.loss * sqrt(d.frequency / port2.frequency);
-            }
-            // convert from db to factor
-            auto att = pow(10.0, -db_attennuation / 20.0);
-            auto correction = polar<double>(att, phase);
-            d.measurements["S22"] /= correction * correction;
-            d.measurements["S21"] /= correction;
-            d.measurements["S12"] /= correction;
+        if(m.first.mid(2, 1).toInt() == port) {
+            // selected port is the source of this S parameter
+            m.second /= correction;
         }
     }
 }
@@ -73,117 +58,56 @@ void PortExtension::edit()
     });
 
     // set initial values
-    ui->P1Enabled->setChecked(port1.enabled);
-    ui->P1Time->setUnit("s");
-    ui->P1Time->setPrefixes("pnum ");
-    ui->P1Distance->setUnit("m");
-    ui->P1Distance->setPrefixes("m ");
-    ui->P1DCloss->setUnit("db");
-    ui->P1Loss->setUnit("db");
-    ui->P1Frequency->setUnit("Hz");
-    ui->P1Frequency->setPrefixes(" kMG");
-    ui->P1Time->setValue(port1.delay);
-    ui->P1Velocity->setValue(port1.velocityFactor);
-    ui->P1Distance->setValue(port1.delay * port1.velocityFactor * c);
-    ui->P1DCloss->setValue(port1.DCloss);
-    ui->P1Loss->setValue(port1.loss);
-    ui->P1Frequency->setValue(port1.frequency);
+    ui->Time->setUnit("s");
+    ui->Time->setPrefixes("pnum ");
+    ui->Distance->setUnit("m");
+    ui->Distance->setPrefixes("m ");
+    ui->DCloss->setUnit("db");
+    ui->Loss->setUnit("db");
+    ui->Frequency->setUnit("Hz");
+    ui->Frequency->setPrefixes(" kMG");
+    ui->Time->setValue(ext.delay);
+    ui->Velocity->setValue(ext.velocityFactor);
+    ui->Distance->setValue(ext.delay * ext.velocityFactor * c);
+    ui->DCloss->setValue(ext.DCloss);
+    ui->Loss->setValue(ext.loss);
+    ui->Frequency->setValue(ext.frequency);
     if(!kit) {
-        ui->P1calkit->setEnabled(false);
-    }
-
-    ui->P2Enabled->setChecked(port2.enabled);
-    ui->P2Time->setUnit("s");
-    ui->P2Time->setPrefixes("pnum ");
-    ui->P2Distance->setUnit("m");
-    ui->P2Distance->setPrefixes("m ");
-    ui->P2DCloss->setUnit("db");
-    ui->P2Loss->setUnit("db");
-    ui->P2Frequency->setUnit("Hz");
-    ui->P2Frequency->setPrefixes(" kMG");
-    ui->P2Time->setValue(port2.delay);
-    ui->P2Velocity->setValue(port2.velocityFactor);
-    ui->P2Distance->setValue(port2.delay * port2.velocityFactor * c);
-    ui->P2DCloss->setValue(port2.DCloss);
-    ui->P2Loss->setValue(port2.loss);
-    ui->P2Frequency->setValue(port2.frequency);
-    if(!kit) {
-        ui->P2calkit->setEnabled(false);
+        ui->calkit->setEnabled(false);
     }
 
     auto updateValuesFromUI = [=](){
-        port1.delay = ui->P1Time->value();
-        port1.velocityFactor = ui->P1Velocity->value();
-        port1.DCloss = ui->P1DCloss->value();
-        port1.loss = ui->P1Loss->value();
-        port1.frequency = ui->P1Frequency->value();
-        port2.delay = ui->P2Time->value();
-        port2.velocityFactor = ui->P2Velocity->value();
-        port2.DCloss = ui->P2DCloss->value();
-        port2.loss = ui->P2Loss->value();
-        port2.frequency = ui->P2Frequency->value();
+        ext.delay = ui->Time->value();
+        ext.velocityFactor = ui->Velocity->value();
+        ext.DCloss = ui->DCloss->value();
+        ext.loss = ui->Loss->value();
+        ext.frequency = ui->Frequency->value();
     };
 
-    connect(ui->P1Enabled, &QCheckBox::toggled, [=](bool enabled) {
-        port1.enabled = enabled;
-    });
     // connections to link delay and distance
-    connect(ui->P1Time, &SIUnitEdit::valueChanged, [=](double newval) {
-        ui->P1Distance->setValueQuiet(newval * ui->P1Velocity->value() * c);
+    connect(ui->Time, &SIUnitEdit::valueChanged, [=](double newval) {
+        ui->Distance->setValueQuiet(newval * ui->Velocity->value() * c);
         updateValuesFromUI();
     });
-    connect(ui->P1Distance, &SIUnitEdit::valueChanged, [=](double newval) {
-        ui->P1Time->setValueQuiet(newval / (ui->P1Velocity->value() * c));
+    connect(ui->Distance, &SIUnitEdit::valueChanged, [=](double newval) {
+        ui->Time->setValueQuiet(newval / (ui->Velocity->value() * c));
         updateValuesFromUI();
     });
-    connect(ui->P1Velocity, &SIUnitEdit::valueChanged, [=](double newval) {
-        ui->P1Time->setValueQuiet(ui->P1Distance->value() / (newval * c));
+    connect(ui->Velocity, &SIUnitEdit::valueChanged, [=](double newval) {
+        ui->Time->setValueQuiet(ui->Distance->value() / (newval * c));
         updateValuesFromUI();
     });
-    connect(ui->P1DCloss, &SIUnitEdit::valueChanged, updateValuesFromUI);
-    connect(ui->P1Loss, &SIUnitEdit::valueChanged, updateValuesFromUI);
-    connect(ui->P1Frequency, &SIUnitEdit::valueChanged, updateValuesFromUI);
-    connect(ui->P1short, &QPushButton::pressed, [=](){
+    connect(ui->DCloss, &SIUnitEdit::valueChanged, updateValuesFromUI);
+    connect(ui->Loss, &SIUnitEdit::valueChanged, updateValuesFromUI);
+    connect(ui->Frequency, &SIUnitEdit::valueChanged, updateValuesFromUI);
+    connect(ui->_short, &QPushButton::pressed, [=](){
         isOpen = false;
-        isPort1 = true;
-        isIdeal = ui->P1ideal->isChecked();
+        isIdeal = ui->ideal->isChecked();
         startMeasurement();
     });
-    connect(ui->P1open, &QPushButton::pressed, [=](){
+    connect(ui->open, &QPushButton::pressed, [=](){
         isOpen = true;
-        isPort1 = true;
-        isIdeal = ui->P1ideal->isChecked();
-        startMeasurement();
-    });
-
-    connect(ui->P2Enabled, &QCheckBox::toggled, [=](bool enabled) {
-        port2.enabled = enabled;
-    });
-    connect(ui->P2Time, &SIUnitEdit::valueChanged, [=](double newval) {
-        ui->P2Distance->setValueQuiet(newval * ui->P2Velocity->value() * c);
-        updateValuesFromUI();
-    });
-    connect(ui->P2Distance, &SIUnitEdit::valueChanged, [=](double newval) {
-        ui->P2Time->setValueQuiet(newval / (ui->P2Velocity->value() * c));
-        updateValuesFromUI();
-    });
-    connect(ui->P2Velocity, &SIUnitEdit::valueChanged, [=](double newval) {
-        ui->P2Time->setValueQuiet(ui->P2Distance->value() / (newval * c));
-        updateValuesFromUI();
-    });
-    connect(ui->P2DCloss, &SIUnitEdit::valueChanged, updateValuesFromUI);
-    connect(ui->P2Loss, &SIUnitEdit::valueChanged, updateValuesFromUI);
-    connect(ui->P2Frequency, &SIUnitEdit::valueChanged, updateValuesFromUI);
-    connect(ui->P2short, &QPushButton::pressed, [=](){
-        isOpen = false;
-        isPort1 = false;
-        isIdeal = ui->P2ideal->isChecked();
-        startMeasurement();
-    });
-    connect(ui->P2open, &QPushButton::pressed, [=](){
-        isOpen = true;
-        isPort1 = false;
-        isIdeal = ui->P2ideal->isChecked();
+        isIdeal = ui->ideal->isChecked();
         startMeasurement();
     });
 
@@ -203,22 +127,17 @@ void PortExtension::measurementCompleted(std::vector<VirtualDevice::VNAMeasureme
         double avg_x = 0.0, avg_y = 0.0;
         for(auto p : m) {
             // grab correct measurement
-            complex<double> reflection;
-            if(isPort1) {
-                reflection = p.measurements["S11"];
-            } else {
-                reflection = p.measurements["S22"];
-            }
+            QString name = "S"+QString::number(port)+QString::number(port);
+            auto reflection = p.measurements[name];
             // remove calkit if specified
             if(!isIdeal) {
                 complex<double> calStandard = 1.0;
-                // TODO
-//                auto standards = kit->toSOLT(p.frequency);
-//                if(isOpen) {
-//                    calStandard = standards.Open;
-//                } else {
-//                    calStandard = standards.Short;
-//                }
+                auto comp = isOpen ? CalStandard::Virtual::Type::Open : CalStandard::Virtual::Type::Short;
+                for(auto s : kit->getStandards()) {
+                    if(s->getType() == comp) {
+                        calStandard = static_cast<CalStandard::OnePort*>(s)->toS11(p.frequency);
+                    }
+                }
                 // remove effect of calibration standard
                 reflection /= calStandard;
             }
@@ -266,23 +185,16 @@ void PortExtension::measurementCompleted(std::vector<VirtualDevice::VNAMeasureme
         double DCloss = -alpha / 2;
         double loss = -beta / 2;
         double freq = m.back().frequency;
-        if(isPort1) {
-            ui->P1Time->setValue(delay);
-            ui->P1DCloss->setValue(DCloss);
-            ui->P1Loss->setValue(loss);
-            ui->P1Frequency->setValue(freq);
-        } else {
-            ui->P2Time->setValue(delay);
-            ui->P2DCloss->setValue(DCloss);
-            ui->P2Loss->setValue(loss);
-            ui->P2Frequency->setValue(freq);
-        }
+        ui->Time->setValue(delay);
+        ui->DCloss->setValue(DCloss);
+        ui->Loss->setValue(loss);
+        ui->Frequency->setValue(freq);
     }
 }
 
 void PortExtension::startMeasurement()
 {
-    emit triggerMeasurement(isPort1, false, false, !isPort1);
+    emit triggerMeasurement();
 }
 
 void PortExtension::setCalkit(Calkit *kit)
@@ -293,35 +205,28 @@ void PortExtension::setCalkit(Calkit *kit)
 nlohmann::json PortExtension::toJSON()
 {
     nlohmann::json j;
-    for(int i=0;i<2;i++) {
-        auto ext = i == 0 ? port1 : port2;
-        nlohmann::json je;
-        je["enabled"] = ext.enabled;
-        je["delay"] = ext.delay;
-        je["velocityFactor"] = ext.velocityFactor;
-        je["DCloss"] = ext.DCloss;
-        je["loss"] = ext.loss;
-        je["frequency"] = ext.frequency;
-        j.push_back(je);
-    }
+    j["port"] = port;
+    j["delay"] = ext.delay;
+    j["velocityFactor"] = ext.velocityFactor;
+    j["DCloss"] = ext.DCloss;
+    j["loss"] = ext.loss;
+    j["frequency"] = ext.frequency;
     return j;
 }
 
 void PortExtension::fromJSON(nlohmann::json j)
 {
-    for(int i=0;i<2;i++) {
-        Extension ext;
-        nlohmann::json je = j[i];
-        ext.enabled = je.value("enabled", false);
-        ext.delay = je.value("delay", 0.0);
-        ext.velocityFactor = je.value("velocityFactor", 0.66);
-        ext.DCloss = je.value("DCloss", 0.0);
-        ext.loss = je.value("loss", 0.0);
-        ext.frequency = je.value("frequency", 6000000000);
-        if(i==0) {
-            port1 = ext;
-        } else {
-            port2 = ext;
-        }
+    nlohmann::json jfrom;
+    if(j.contains("port")) {
+        // new format
+        jfrom = j;
+    } else {
+        jfrom = j[0];
+        port = 1;
     }
+    ext.delay = jfrom.value("delay", 0.0);
+    ext.velocityFactor = jfrom.value("velocityFactor", 0.66);
+    ext.DCloss = jfrom.value("DCloss", 0.0);
+    ext.loss = jfrom.value("loss", 0.0);
+    ext.frequency = jfrom.value("frequency", 6000000000);
 }
diff --git a/Software/PC_Application/VNA/Deembedding/portextension.h b/Software/PC_Application/VNA/Deembedding/portextension.h
index fa649df..5013e0b 100644
--- a/Software/PC_Application/VNA/Deembedding/portextension.h
+++ b/Software/PC_Application/VNA/Deembedding/portextension.h
@@ -31,18 +31,17 @@ private:
     void startMeasurement();
     class Extension {
     public:
-        bool enabled;
         double delay;
         double velocityFactor;
         double DCloss;
         double loss;
         double frequency;
     };
-    Extension port1, port2;
+    Extension ext;
 
     // status variables for automatic measurements
     Calkit *kit;
-    bool isPort1;
+    int port;
     bool isOpen;
     bool isIdeal;
 
diff --git a/Software/PC_Application/VNA/Deembedding/portextensioneditdialog.ui b/Software/PC_Application/VNA/Deembedding/portextensioneditdialog.ui
index a245e38..3100071 100644
--- a/Software/PC_Application/VNA/Deembedding/portextensioneditdialog.ui
+++ b/Software/PC_Application/VNA/Deembedding/portextensioneditdialog.ui
@@ -9,8 +9,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>318</width>
-    <height>505</height>
+    <width>312</width>
+    <height>459</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -21,310 +21,157 @@
   </property>
   <layout class="QVBoxLayout" name="verticalLayout_3">
    <item>
-    <widget class="QTabWidget" name="tabWidget">
-     <property name="currentIndex">
-      <number>0</number>
+    <layout class="QFormLayout" name="formLayout_2">
+     <item row="0" column="0">
+      <widget class="QLabel" name="label_11">
+       <property name="text">
+        <string>Port:</string>
+       </property>
+      </widget>
+     </item>
+     <item row="0" column="1">
+      <widget class="QSpinBox" name="port">
+       <property name="minimum">
+        <number>1</number>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="QGroupBox" name="groupBox">
+     <property name="title">
+      <string>Delay</string>
      </property>
-     <widget class="QWidget" name="tab">
-      <attribute name="title">
-       <string>Port 1</string>
-      </attribute>
-      <layout class="QVBoxLayout" name="verticalLayout_7">
-       <item>
-        <widget class="QCheckBox" name="P1Enabled">
-         <property name="text">
-          <string>Enabled</string>
-         </property>
-        </widget>
-       </item>
-       <item>
-        <widget class="QGroupBox" name="groupBox">
-         <property name="title">
-          <string>Delay</string>
-         </property>
-         <layout class="QFormLayout" name="formLayout">
-          <item row="0" column="0">
-           <widget class="QLabel" name="label">
-            <property name="text">
-             <string>Distance:</string>
-            </property>
-           </widget>
-          </item>
-          <item row="0" column="1">
-           <widget class="SIUnitEdit" name="P1Distance"/>
-          </item>
-          <item row="1" column="0">
-           <widget class="QLabel" name="label_2">
-            <property name="text">
-             <string>Time:</string>
-            </property>
-           </widget>
-          </item>
-          <item row="1" column="1">
-           <widget class="SIUnitEdit" name="P1Time"/>
-          </item>
-          <item row="2" column="0">
-           <widget class="QLabel" name="label_3">
-            <property name="text">
-             <string>Velocity Factor:</string>
-            </property>
-           </widget>
-          </item>
-          <item row="2" column="1">
-           <widget class="SIUnitEdit" name="P1Velocity"/>
-          </item>
-         </layout>
-        </widget>
-       </item>
-       <item>
-        <widget class="QGroupBox" name="groupBox_2">
-         <property name="title">
-          <string>Loss</string>
-         </property>
-         <layout class="QVBoxLayout" name="verticalLayout">
-          <item>
-           <layout class="QHBoxLayout" name="horizontalLayout_2">
-            <item>
-             <widget class="QLabel" name="label_4">
-              <property name="text">
-               <string>At DC:</string>
-              </property>
-             </widget>
-            </item>
-            <item>
-             <widget class="SIUnitEdit" name="P1DCloss"/>
-            </item>
-            <item>
-             <spacer name="horizontalSpacer">
-              <property name="orientation">
-               <enum>Qt::Horizontal</enum>
-              </property>
-              <property name="sizeHint" stdset="0">
-               <size>
-                <width>40</width>
-                <height>20</height>
-               </size>
-              </property>
-             </spacer>
-            </item>
-           </layout>
-          </item>
-          <item>
-           <layout class="QHBoxLayout" name="horizontalLayout">
-            <item>
-             <widget class="SIUnitEdit" name="P1Loss"/>
-            </item>
-            <item>
-             <widget class="QLabel" name="label_5">
-              <property name="text">
-               <string>at</string>
-              </property>
-             </widget>
-            </item>
-            <item>
-             <widget class="SIUnitEdit" name="P1Frequency"/>
-            </item>
-           </layout>
-          </item>
-         </layout>
-        </widget>
-       </item>
-       <item>
-        <widget class="QGroupBox" name="groupBox_3">
-         <property name="title">
-          <string>Determine automatically</string>
-         </property>
-         <layout class="QVBoxLayout" name="verticalLayout_2">
-          <item>
-           <widget class="QRadioButton" name="P1ideal">
-            <property name="text">
-             <string>Assume ideal open/short</string>
-            </property>
-            <property name="checked">
-             <bool>true</bool>
-            </property>
-           </widget>
-          </item>
-          <item>
-           <widget class="QRadioButton" name="P1calkit">
-            <property name="text">
-             <string>Use definition from calibration kit</string>
-            </property>
-           </widget>
-          </item>
-          <item>
-           <layout class="QHBoxLayout" name="horizontalLayout_3">
-            <item>
-             <widget class="QPushButton" name="P1short">
-              <property name="text">
-               <string>Measure short</string>
-              </property>
-             </widget>
-            </item>
-            <item>
-             <widget class="QPushButton" name="P1open">
-              <property name="text">
-               <string>Measure open</string>
-              </property>
-             </widget>
-            </item>
-           </layout>
-          </item>
-         </layout>
-        </widget>
-       </item>
-      </layout>
-     </widget>
-     <widget class="QWidget" name="tab_2">
-      <attribute name="title">
-       <string>Port 2</string>
-      </attribute>
-      <layout class="QVBoxLayout" name="verticalLayout_6">
-       <item>
-        <widget class="QCheckBox" name="P2Enabled">
-         <property name="text">
-          <string>Enabled</string>
-         </property>
-        </widget>
-       </item>
-       <item>
-        <widget class="QGroupBox" name="groupBox_6">
-         <property name="title">
-          <string>Delay</string>
-         </property>
-         <layout class="QFormLayout" name="formLayout_2">
-          <item row="0" column="0">
-           <widget class="QLabel" name="label_8">
-            <property name="text">
-             <string>Distance:</string>
-            </property>
-           </widget>
-          </item>
-          <item row="0" column="1">
-           <widget class="SIUnitEdit" name="P2Distance"/>
-          </item>
-          <item row="1" column="0">
-           <widget class="QLabel" name="label_9">
-            <property name="text">
-             <string>Time:</string>
-            </property>
-           </widget>
-          </item>
-          <item row="1" column="1">
-           <widget class="SIUnitEdit" name="P2Time"/>
-          </item>
-          <item row="2" column="0">
-           <widget class="QLabel" name="label_10">
-            <property name="text">
-             <string>Velocity Factor:</string>
-            </property>
-           </widget>
-          </item>
-          <item row="2" column="1">
-           <widget class="SIUnitEdit" name="P2Velocity"/>
-          </item>
-         </layout>
-        </widget>
-       </item>
-       <item>
-        <widget class="QGroupBox" name="groupBox_5">
-         <property name="title">
-          <string>Loss</string>
-         </property>
-         <layout class="QVBoxLayout" name="verticalLayout_5">
-          <item>
-           <layout class="QHBoxLayout" name="horizontalLayout_5">
-            <item>
-             <widget class="QLabel" name="label_6">
-              <property name="text">
-               <string>At DC:</string>
-              </property>
-             </widget>
-            </item>
-            <item>
-             <widget class="SIUnitEdit" name="P2DCloss"/>
-            </item>
-            <item>
-             <spacer name="horizontalSpacer_2">
-              <property name="orientation">
-               <enum>Qt::Horizontal</enum>
-              </property>
-              <property name="sizeHint" stdset="0">
-               <size>
-                <width>40</width>
-                <height>20</height>
-               </size>
-              </property>
-             </spacer>
-            </item>
-           </layout>
-          </item>
-          <item>
-           <layout class="QHBoxLayout" name="horizontalLayout_6">
-            <item>
-             <widget class="SIUnitEdit" name="P2Loss"/>
-            </item>
-            <item>
-             <widget class="QLabel" name="label_7">
-              <property name="text">
-               <string>at</string>
-              </property>
-             </widget>
-            </item>
-            <item>
-             <widget class="SIUnitEdit" name="P2Frequency"/>
-            </item>
-           </layout>
-          </item>
-         </layout>
-        </widget>
-       </item>
-       <item>
-        <widget class="QGroupBox" name="groupBox_4">
-         <property name="title">
-          <string>Determine automatically</string>
-         </property>
-         <layout class="QVBoxLayout" name="verticalLayout_4">
-          <item>
-           <widget class="QRadioButton" name="P2ideal">
-            <property name="text">
-             <string>Assume ideal open/short</string>
-            </property>
-            <property name="checked">
-             <bool>true</bool>
-            </property>
-           </widget>
-          </item>
-          <item>
-           <widget class="QRadioButton" name="P2calkit">
-            <property name="text">
-             <string>Use definition from calibration kit</string>
-            </property>
-           </widget>
-          </item>
-          <item>
-           <layout class="QHBoxLayout" name="horizontalLayout_4">
-            <item>
-             <widget class="QPushButton" name="P2short">
-              <property name="text">
-               <string>Measure short</string>
-              </property>
-             </widget>
-            </item>
-            <item>
-             <widget class="QPushButton" name="P2open">
-              <property name="text">
-               <string>Measure open</string>
-              </property>
-             </widget>
-            </item>
-           </layout>
-          </item>
-         </layout>
-        </widget>
-       </item>
-      </layout>
-     </widget>
+     <layout class="QFormLayout" name="formLayout">
+      <item row="0" column="0">
+       <widget class="QLabel" name="label">
+        <property name="text">
+         <string>Distance:</string>
+        </property>
+       </widget>
+      </item>
+      <item row="0" column="1">
+       <widget class="SIUnitEdit" name="Distance"/>
+      </item>
+      <item row="1" column="0">
+       <widget class="QLabel" name="label_2">
+        <property name="text">
+         <string>Time:</string>
+        </property>
+       </widget>
+      </item>
+      <item row="1" column="1">
+       <widget class="SIUnitEdit" name="Time"/>
+      </item>
+      <item row="2" column="0">
+       <widget class="QLabel" name="label_3">
+        <property name="text">
+         <string>Velocity Factor:</string>
+        </property>
+       </widget>
+      </item>
+      <item row="2" column="1">
+       <widget class="SIUnitEdit" name="Velocity"/>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item>
+    <widget class="QGroupBox" name="groupBox_2">
+     <property name="title">
+      <string>Loss</string>
+     </property>
+     <layout class="QVBoxLayout" name="verticalLayout">
+      <item>
+       <layout class="QHBoxLayout" name="horizontalLayout_2">
+        <item>
+         <widget class="QLabel" name="label_4">
+          <property name="text">
+           <string>At DC:</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="SIUnitEdit" name="DCloss"/>
+        </item>
+        <item>
+         <spacer name="horizontalSpacer">
+          <property name="orientation">
+           <enum>Qt::Horizontal</enum>
+          </property>
+          <property name="sizeHint" stdset="0">
+           <size>
+            <width>40</width>
+            <height>20</height>
+           </size>
+          </property>
+         </spacer>
+        </item>
+       </layout>
+      </item>
+      <item>
+       <layout class="QHBoxLayout" name="horizontalLayout">
+        <item>
+         <widget class="SIUnitEdit" name="Loss"/>
+        </item>
+        <item>
+         <widget class="QLabel" name="label_5">
+          <property name="text">
+           <string>at</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="SIUnitEdit" name="Frequency"/>
+        </item>
+       </layout>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item>
+    <widget class="QGroupBox" name="groupBox_3">
+     <property name="title">
+      <string>Determine automatically</string>
+     </property>
+     <layout class="QVBoxLayout" name="verticalLayout_2">
+      <item>
+       <widget class="QRadioButton" name="ideal">
+        <property name="text">
+         <string>Assume ideal open/short</string>
+        </property>
+        <property name="checked">
+         <bool>true</bool>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QRadioButton" name="calkit">
+        <property name="text">
+         <string>Use definition from calibration kit</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <layout class="QHBoxLayout" name="horizontalLayout_3">
+        <item>
+         <widget class="QPushButton" name="_short">
+          <property name="text">
+           <string>Measure short</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QPushButton" name="open">
+          <property name="text">
+           <string>Measure open</string>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </item>
+     </layout>
     </widget>
    </item>
    <item>
diff --git a/Software/PC_Application/VNA/Deembedding/twothru.cpp b/Software/PC_Application/VNA/Deembedding/twothru.cpp
index 6af2cc0..062298c 100644
--- a/Software/PC_Application/VNA/Deembedding/twothru.cpp
+++ b/Software/PC_Application/VNA/Deembedding/twothru.cpp
@@ -13,13 +13,15 @@ using namespace std;
 TwoThru::TwoThru()
 {
     Z0 = 50.0;
+    port1 = 1;
+    port2 = 2;
 }
 
 void TwoThru::transformDatapoint(VirtualDevice::VNAMeasurement &p)
 {
     // correct measurement
     if(points.size() > 0) {
-        Tparam meas(p.toSparam(1,2));
+        Tparam meas(p.toSparam(port1,port2));
 
         Tparam inv1, inv2;
         if(p.frequency < points.front().freq) {
@@ -49,7 +51,7 @@ void TwoThru::transformDatapoint(VirtualDevice::VNAMeasurement &p)
         // perform correction
         Tparam corrected = inv1*meas*inv2;
         // transform back into S parameters
-        p.fromSparam(Sparam(corrected), 1, 2);
+        p.fromSparam(Sparam(corrected), port1, port2);
     }
 }
 
@@ -125,6 +127,27 @@ void TwoThru::edit()
     ui->Z0->setVisible(false);
     ui->lZ0->setVisible(false);
 
+    ui->port1->setValue(port1);
+    ui->port1->setMaximum(VirtualDevice::getInfo(VirtualDevice::getConnected()).ports);
+    ui->port2->setValue(port2);
+    ui->port2->setMaximum(VirtualDevice::getInfo(VirtualDevice::getConnected()).ports);
+
+    auto portChanged = [=](){
+        port1 = ui->port1->value();
+        port2 = ui->port2->value();
+        // clear all points
+        points.clear();
+        measurements2xthru.clear();
+        measurementsDUT.clear();
+        // enable taking of new measurements only if ports are different
+        ui->bMeasure->setEnabled(port1 != port2);
+        ui->bMeasureDUT->setEnabled(port1 != port2);
+        updateGUI();
+    };
+
+    connect(ui->port1, qOverload<int>(&QSpinBox::valueChanged), portChanged);
+    connect(ui->port2, qOverload<int>(&QSpinBox::valueChanged), portChanged);
+
     connect(ui->bMeasure, &QPushButton::clicked, [=](){
         measuringDUT = false;
         measuring2xthru = true;
@@ -168,6 +191,8 @@ void TwoThru::edit()
 nlohmann::json TwoThru::toJSON()
 {
     nlohmann::json j;
+    j["port1"] = port1;
+    j["port2"] = port2;
     for(auto p : points) {
         nlohmann::json jp;
         jp["frequency"] = p.freq;
@@ -194,6 +219,8 @@ nlohmann::json TwoThru::toJSON()
 
 void TwoThru::fromJSON(nlohmann::json j)
 {
+    port1 = j.value("port1", 1);
+    port2 = j.value("port2", 2);
     points.clear();
     for(auto jp : j) {
         Point p;
@@ -229,10 +256,11 @@ std::vector<TwoThru::Point> TwoThru::calculateErrorBoxes(std::vector<VirtualDevi
             // ignore possible DC point
             continue;
         }
-        S11.push_back(m.measurements["S11"]);
-        S12.push_back(m.measurements["S12"]);
-        S21.push_back(m.measurements["S21"]);
-        S22.push_back(m.measurements["S22"]);
+        auto S = m.toSparam(port1, port2);
+        S11.push_back(S.m11);
+        S12.push_back(S.m12);
+        S21.push_back(S.m21);
+        S22.push_back(S.m22);
         f.push_back(m.frequency);
     }
     auto n = f.size();
diff --git a/Software/PC_Application/VNA/Deembedding/twothru.h b/Software/PC_Application/VNA/Deembedding/twothru.h
index aec4bf7..54b664a 100644
--- a/Software/PC_Application/VNA/Deembedding/twothru.h
+++ b/Software/PC_Application/VNA/Deembedding/twothru.h
@@ -33,12 +33,13 @@ private:
     };
 
     static std::vector<VirtualDevice::VNAMeasurement> interpolateEvenFrequencySteps(std::vector<VirtualDevice::VNAMeasurement> input);
-    static std::vector<Point> calculateErrorBoxes(std::vector<VirtualDevice::VNAMeasurement> data_2xthru);
-    static std::vector<Point> calculateErrorBoxes(std::vector<VirtualDevice::VNAMeasurement> data_2xthru, std::vector<VirtualDevice::VNAMeasurement> data_fix_dut_fix, double z0);
+    std::vector<Point> calculateErrorBoxes(std::vector<VirtualDevice::VNAMeasurement> data_2xthru);
+    std::vector<Point> calculateErrorBoxes(std::vector<VirtualDevice::VNAMeasurement> data_2xthru, std::vector<VirtualDevice::VNAMeasurement> data_fix_dut_fix, double z0);
 
     std::vector<VirtualDevice::VNAMeasurement> measurements2xthru;
     std::vector<VirtualDevice::VNAMeasurement> measurementsDUT;
     double Z0;
+    int port1, port2;
     std::vector<Point> points;
     bool measuring2xthru;
     bool measuringDUT;
diff --git a/Software/PC_Application/VNA/Deembedding/twothrudialog.ui b/Software/PC_Application/VNA/Deembedding/twothrudialog.ui
index 29ac935..8de43dc 100644
--- a/Software/PC_Application/VNA/Deembedding/twothrudialog.ui
+++ b/Software/PC_Application/VNA/Deembedding/twothrudialog.ui
@@ -9,8 +9,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>701</width>
-    <height>465</height>
+    <width>732</width>
+    <height>520</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -19,7 +19,7 @@
   <property name="modal">
    <bool>true</bool>
   </property>
-  <layout class="QVBoxLayout" name="verticalLayout" stretch="1,0,0">
+  <layout class="QVBoxLayout" name="verticalLayout" stretch="1,0,0,0">
    <item>
     <widget class="QGroupBox" name="groupBox_3">
      <property name="title">
@@ -51,6 +51,56 @@
      </layout>
     </widget>
    </item>
+   <item>
+    <widget class="QGroupBox" name="groupBox_4">
+     <property name="title">
+      <string>Configuration</string>
+     </property>
+     <layout class="QHBoxLayout" name="horizontalLayout_2">
+      <item>
+       <widget class="QLabel" name="label_4">
+        <property name="text">
+         <string>2xthru is between ports</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QSpinBox" name="port1">
+        <property name="minimum">
+         <number>1</number>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QLabel" name="label_5">
+        <property name="text">
+         <string>and</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QSpinBox" name="port2">
+        <property name="minimum">
+         <number>1</number>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <spacer name="horizontalSpacer">
+        <property name="orientation">
+         <enum>Qt::Horizontal</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>40</width>
+          <height>20</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+     </layout>
+    </widget>
+   </item>
    <item>
     <widget class="QGroupBox" name="groupBox">
      <property name="title">
diff --git a/Software/PC_Application/main.cpp b/Software/PC_Application/main.cpp
index ced0fea..cabdd98 100644
--- a/Software/PC_Application/main.cpp
+++ b/Software/PC_Application/main.cpp
@@ -1,11 +1,14 @@
 #include "appwindow.h"
 #include <QtWidgets/QApplication>
 #include "Device/device.h"
-#include "Device/virtualdevice.h"
 #ifdef Q_OS_UNIX
 #include <signal.h>
 #endif
 
+#include "Tools/parameters.h"
+#include <complex>
+using namespace std;
+
 static QApplication *app;
 static AppWindow *window;
 
@@ -21,9 +24,6 @@ int main(int argc, char *argv[]) {
 
     qSetMessagePattern("%{time process}: [%{type}] %{message}");
 
-    Device::RegisterTypes();
-    VirtualDevice::RegisterTypes();
-
     app = new QApplication(argc, argv);
     QCoreApplication::setOrganizationName("LibreVNA");
     QCoreApplication::setApplicationName("LibreVNA-GUI");
@@ -31,6 +31,34 @@ int main(int argc, char *argv[]) {
     QCoreApplication::setApplicationVersion(window->getAppVersion() + "-" +
                                             window->getAppGitHash().left(9));
 
+    Device::RegisterTypes();
+
+    auto S11 = complex<double>(-0.5, 0.25);
+    auto S22 = complex<double>(0.5, 0.15);
+    auto S33 = complex<double>(0.8, -0.25);
+
+    auto S12 = complex<double>(0.1, 0);
+    auto S21 = complex<double>(0.2, 0.3);
+
+    auto S13 = complex<double>(0.3, -0.2);
+    auto S31 = complex<double>(0.4, 0.4);
+
+    auto S23 = complex<double>(0.5, 0.2);
+    auto S32 = complex<double>(0.6, -0.2);
+
+    auto p12 = Sparam(S11, S12, S21, S22);
+    auto p12_only = Sparam(0.0, S12, 1.0, 0.0);
+    auto p13 = Sparam(S11, S13, S31, S33);
+    auto p23 = Sparam(S22, S23, S32, S33);
+
+    // convert to 75 ohm
+    auto p12_75 = Sparam(ABCDparam(p12, 50.0), 75.0);
+    auto p12_only_75 = Sparam(ABCDparam(p12_only, 50.0), 75.0);
+    auto p13_75 = Sparam(ABCDparam(p12, 50.0), 75.0);
+    auto Zp23_75 = Sparam(ABCDparam(p12, 50.0), 75.0);
+
+    auto p1 = Sparam(S11, 0.0, 0.0, 1.0);
+    auto p1_75 = Sparam(ABCDparam(p12, 50.0), 75.0);
 
 #ifdef Q_OS_UNIX
     signal(SIGINT, tryExitGracefully);
diff --git a/Software/PC_Application/preferences.cpp b/Software/PC_Application/preferences.cpp
index ea19482..aa95f8e 100644
--- a/Software/PC_Application/preferences.cpp
+++ b/Software/PC_Application/preferences.cpp
@@ -310,6 +310,7 @@ void PreferencesDialog::setInitialGUIState()
     ui->MarkerShowAllMarkerData->setChecked(p->Marker.defaultBehavior.showAllData);
     ui->MarkerInterpolate->setCurrentIndex(p->Marker.interpolatePoints ? 1 : 0);
     ui->MarkerSortOrder->setCurrentIndex((int) p->Marker.sortOrder);
+    ui->MarkerSymbolStyle->setCurrentIndex((int) p->Marker.symbolStyle);
 
     ui->SCPIServerEnabled->setChecked(p->SCPIServer.enabled);
     ui->SCPIServerPort->setValue(p->SCPIServer.port);
@@ -380,6 +381,7 @@ void PreferencesDialog::updateFromGUI()
     p->Marker.defaultBehavior.showAllData = ui->MarkerShowAllMarkerData->isChecked();
     p->Marker.interpolatePoints = ui->MarkerInterpolate->currentIndex() == 1;
     p->Marker.sortOrder = (MarkerSortOrder) ui->MarkerSortOrder->currentIndex();
+    p->Marker.symbolStyle = (MarkerSymbolStyle) ui->MarkerSymbolStyle->currentIndex();
 
     p->SCPIServer.enabled = ui->SCPIServerEnabled->isChecked();
     p->SCPIServer.port = ui->SCPIServerPort->value();
diff --git a/Software/PC_Application/preferences.h b/Software/PC_Application/preferences.h
index 1699e9f..fab2a8e 100644
--- a/Software/PC_Application/preferences.h
+++ b/Software/PC_Application/preferences.h
@@ -34,6 +34,14 @@ enum MarkerSortOrder {
 
 Q_DECLARE_METATYPE(MarkerSortOrder)
 
+enum MarkerSymbolStyle {
+    FilledNumberInside = 0,
+    FilledNumberAbove = 1,
+    EmptyNumberAbove = 2,
+};
+
+Q_DECLARE_METATYPE(MarkerSymbolStyle);
+
 
 class Preferences : public Savable {
 public:
@@ -126,6 +134,7 @@ public:
         } defaultBehavior;
         bool interpolatePoints;
         MarkerSortOrder sortOrder;
+        MarkerSymbolStyle symbolStyle;
     } Marker;
     struct {
         bool enabled;
@@ -204,6 +213,7 @@ private:
         {&Marker.defaultBehavior.showAllData, "Marker.defaultBehavior.ShowAllData", false},
         {&Marker.interpolatePoints, "Marker.interpolatePoints", false},
         {&Marker.sortOrder, "Marker.sortOrder", MarkerSortOrder::PrefMarkerSortXCoord},
+        {&Marker.symbolStyle, "Marker.symbolStyle", MarkerSymbolStyle::EmptyNumberAbove},
         {&SCPIServer.enabled, "SCPIServer.enabled", true},
         {&SCPIServer.port, "SCPIServer.port", 19542},
         {&compoundDeviceJSON, "compoundDeviceJSON", "[]"},
diff --git a/Software/PC_Application/preferencesdialog.ui b/Software/PC_Application/preferencesdialog.ui
index f7fa1a9..76da164 100644
--- a/Software/PC_Application/preferencesdialog.ui
+++ b/Software/PC_Application/preferencesdialog.ui
@@ -84,7 +84,7 @@
           <x>0</x>
           <y>0</y>
           <width>687</width>
-          <height>938</height>
+          <height>884</height>
          </rect>
         </property>
         <layout class="QHBoxLayout" name="horizontalLayout_12">
@@ -103,7 +103,7 @@
             </size>
            </property>
            <property name="currentIndex">
-            <number>1</number>
+            <number>0</number>
            </property>
            <widget class="QWidget" name="Startup">
             <layout class="QHBoxLayout" name="horizontalLayout_4">
@@ -1286,6 +1286,32 @@
                    </item>
                   </widget>
                  </item>
+                 <item row="2" column="0">
+                  <widget class="QLabel" name="label_45">
+                   <property name="text">
+                    <string>Symbol Style:</string>
+                   </property>
+                  </widget>
+                 </item>
+                 <item row="2" column="1">
+                  <widget class="QComboBox" name="MarkerSymbolStyle">
+                   <item>
+                    <property name="text">
+                     <string>Filled triangle - Marker number inside</string>
+                    </property>
+                   </item>
+                   <item>
+                    <property name="text">
+                     <string>Filled triangle - Marker number above</string>
+                    </property>
+                   </item>
+                   <item>
+                    <property name="text">
+                     <string>Empty triangle - Marker number above</string>
+                    </property>
+                   </item>
+                  </widget>
+                 </item>
                 </layout>
                </item>
                <item>