diff --git a/examples/MVLinac/TestComponent.txt b/examples/MVLinac/TestComponent.txt
index 1c77aad..db79186 100644
--- a/examples/MVLinac/TestComponent.txt
+++ b/examples/MVLinac/TestComponent.txt
@@ -20,4 +20,42 @@ includeFile = Flattener18MV.txt #Comment out at least one of the flatteners
 #includeFile = WaterBox.txt #Comment out at least one of the dose scoring regions
 #includeFile = WaterPhantom.txt #Comment out at least one of the dose scoring regions
 
+# Source selection (electron or x-ray) and number of histories in run
+ic:So/ElectronSource/NumberOfHistoriesInRun      = 100 
+#ic:So/XraySource/NumberOfHistoriesInRun         = 100 
 
+# Source at nominal position of target
+# Parent is the gantry with coordinates IEC_G (see Main.txt)
+s:Ge/BeamPosition/Parent                         = "IEC_G"
+dc:Ge/BeamPosition/Pos                           = -1.0 cm 
+d:Ge/BeamPosition/TransZ                         = Ge/SAD - Ge/BeamPosition/Pos cm
+
+# Electron source
+s:So/ElectronSource/Type                         = "Beam"
+s:So/ElectronSource/Component                    = "BeamPosition"
+s:So/ElectronSource/BeamParticle                 = "e-"
+d:So/ElectronSource/BeamEnergy                   = 6.51 MeV #6 MV Oncor
+u:So/ElectronSource/BeamEnergySpread             = 4.2      #10% FWHM 6 MV Oncor
+s:So/ElectronSource/BeamPositionDistribution     = "Gaussian"
+s:So/ElectronSource/BeamPositionCutoffShape      = "Ellipse"
+d:So/ElectronSource/BeamPositionCutoffX          = 1.2 mm   #2 standard deviations
+d:So/ElectronSource/BeamPositionCutoffY          = 1.2 mm
+d:So/ElectronSource/BeamPositionSpreadX          = 0.6 mm   #1.5 mm FWHM
+d:So/ElectronSource/BeamPositionSpreadY          = 0.6 mm     
+s:So/ElectronSource/BeamAngularDistribution      = "None"
+
+# Monoenergetic x-ray source 
+s:So/XraySource/Type                             = "Beam"
+s:So/XraySource/Component                        = "BeamPosition"
+s:So/XraySource/BeamParticle                     = "gamma"
+d:So/XraySource/BeamEnergy                       = 2 MeV 
+u:So/XraySource/BeamEnergySpread                 = 0.1 
+s:So/XraySource/BeamPositionDistribution         = "Gaussian"
+s:So/XraySource/BeamPositionCutoffShape          = "Ellipse"
+d:So/XraySource/BeamPositionCutoffX              = 1.2 mm   #2 standard deviations
+d:So/XraySource/BeamPositionCutoffY              = 1.2 mm
+d:So/XraySource/BeamPositionSpreadX              = 0.6 mm   #1.5 mm FWHM
+d:So/XraySource/BeamPositionSpreadY              = 0.6 mm     
+s:So/XraySource/BeamAngularDistribution          = "Flat"
+d:So/XraySource/BeamAngularCutoffX               = 14. deg  #50 cm diameter collimator
+d:So/XraySource/BeamAngularCutoffY               = 14. deg