1 files changed, 1 insertions, 1 deletions
diff --git a/sim.py b/sim.py
index ed926f8..7520caf 100755
--- a/sim.py
+++ b/sim.py
@@ -39,7 +39,7 @@ if __name__ == '__main__':
     parser.add_option('--particle', type='string', dest='particle', default='e-')
     parser.add_option('--energy', type='float', dest='energy', default=100.0)
     parser.add_option('--pos', type='string', dest='pos', default='(0,0,0)')
-    parser.add_option('--dir', type='string', dest='dir', default='(1,0,0)')
+    parser.add_option('--dir', type='string', dest='dir', default='(0,1,0)')
 
     options, args = parser.parse_args()
     if len(args) != 1: