Detect unsupported collimator names, give a warning, and set the opening to 1000 sigma (not whatever it was in the previous collimator).
Detect unsupported collimator names, give a warning, and set the opening to 1000 sigma (not whatever it was in the previous collimator).

SixTrack/SixTrack,SixTrack/SixTrack,SixTrack/SixTrack,SixTrack/SixTrack,SixTrack/SixTrack,SixTrack/SixTrack