diff --git a/mac/n16gs.mac b/mac/n16gs.mac
new file mode 100644
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+
+/control/execute init.mac
+
+# magnetic field strength
+/VK/field/maxbfield 0.48 tesla
+
+# source dimensions
+/VK/source/diskShapedSource true
+/VK/source/innerDiameter 0 cm
+/VK/source/outerDiameter 4 mm
+
+# radiation
+/gps/particle e-
+/gps/position 0 0 -29.9 cm
+/gps/ang/type iso
+/gps/ang/mintheta  90 deg
+/gps/ang/maxtheta 180 deg
+
+# energy spectrum
+/VK/source/betaSpectrum true
+/VK/source/betaEndPoint 10.42 MeV
+/VK/source/betaMinEnergy 0 MeV
+/VK/source/betaMaxEnergy 10.42 MeV
+
+# output 
+/VK/output/zeroSuppression true
+/VK/storeTrajectoryData false
+
+# run simulation
+/VK/output/openFile output/n16gs.root                
+/run/beamOn 100000