[yt-users] FLASH hydro parameters?

Hi all, I just noticed that hydro parameters like Gamma and EOSType are not defined for flash parameter files. This makes it impossible to compute the sound speed using the definition in universal_fields.py. I've already modified the FLASH reader to ignore EOSType but I can't figure out how to gracefully figure out what Gamma is. It looks like enzo somehow automatically detects the existence of the Gamma parameter, but I don't see how the enzo reader does this. Can someone point me to the correct place? Thanks, Nathan