WCSim Validation

81046c7edf94037a3bffdf8ec41860c14af8fe41

Pull Request #520: Update LI code, better sampling

IWCD_500MeVmum_centre_xdir

Tests
2821.64 sec
wcsimrootevent plot pass
wcsimrootevent2 plot pass
wcsimrootevent_OD plot pass
Geom pass
bad pass
Geometry warnings pass