Although a lot of work is put into eliminating geometry errors, a few remain that are not worth the effort to fix. Instead the normal procedure is to fail the event. This is adequate for most types of MC run, but not for events with very large light yields e.g. muons, where the large number of photons tracked increases the possibility that a geometry error will cause the event will fail to an unacceptible level. To deal with these situations the user can tell SNOMAN to accept a certain number of photon tracking errors. For example:-
$max_cer_ge_errors 20
will allow 20 photons to be failed in a single event before a fatal geometry error is signaled.
Note that this error suppression only works with the MC and only when tracking photons.