WCSim Validation

c750a694e10a41af0b343f2e477266dfe1521e5b

Pull Request #520: Update LI code, better sampling

HKFD_5MeVem_centre_xdir

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