diff --git a/FDTD/engine_ext_cylinder.cpp b/FDTD/engine_ext_cylinder.cpp
index 72fc021..1ac704e 100644
--- a/FDTD/engine_ext_cylinder.cpp
+++ b/FDTD/engine_ext_cylinder.cpp
@@ -21,11 +21,13 @@
 
 Engine_Ext_Cylinder::Engine_Ext_Cylinder(Operator_Ext_Cylinder* op_ext) : Engine_Extension(op_ext)
 {
+	cyl_Op = op_ext;
+
 	CC_closedAlpha = op_ext->CC_closedAlpha;
 	CC_R0_included = op_ext->CC_R0_included;
 
 	for (int n=0;n<3;++n)
-		numLines[n] = op_ext->m_Op->GetNumberOfLines(n);
+		numLines[n] = op_ext->m_Op->GetOriginalNumLines(n);
 }
 
 void Engine_Ext_Cylinder::Apply2Voltages()
diff --git a/FDTD/operator_ext_cylinder.cpp b/FDTD/operator_ext_cylinder.cpp
index df5860b..81e6b6b 100644
--- a/FDTD/operator_ext_cylinder.cpp
+++ b/FDTD/operator_ext_cylinder.cpp
@@ -29,18 +29,18 @@ bool Operator_Ext_Cylinder::BuildExtension()
 	if ((CC_R0_included==false) || (CC_closedAlpha==false))
 		return true;
 
-	vv_R0 = new FDTD_FLOAT[m_Op->GetNumberOfLines(2)];
-	vi_R0 = new FDTD_FLOAT[m_Op->GetNumberOfLines(2)];
+	vv_R0 = new FDTD_FLOAT[m_Op->GetOriginalNumLines(2)];
+	vi_R0 = new FDTD_FLOAT[m_Op->GetOriginalNumLines(2)];
 
 	unsigned int pos[3];
 	double inEC[4];
 	double dT = m_Op->GetTimestep();
 	pos[0]=0;
-	for (pos[2]=0;pos[2]<m_Op->GetNumberOfLines(2);++pos[2])
+	for (pos[2]=0;pos[2]<m_Op->GetOriginalNumLines(2);++pos[2])
 	{
 		double C=0;
 		double G=0;
-		for (pos[1]=0;pos[1]<m_Op->GetNumberOfLines(1)-1;++pos[1])
+		for (pos[1]=0;pos[1]<m_Op->GetOriginalNumLines(1)-1;++pos[1])
 		{
 			m_Op_Cyl->Calc_ECPos(2,pos,inEC);
 			C+=inEC[0]*0.5;