[yt-users] reading the fields correctly (ramses-rt)

Hi all, I'm experiencing a little trouble in reading some RAMSES files which include radiative transfer. In this (broadly used) implementation some of the fields do not follow the order they have classical RAMSES files; e.g. the pressure field is later in the fields list. Indeed when I read the files those fields do not have the correct content. Can someone please suggest a possible workaround? For instance a plugin for this kind of files, if it exists, or suggest how I could swap the fields, or rename them with the correct name? I do not want simply to create new fields, without correcting the default ones, as all derived fields (and possibly other valuable yt features) would not work properly. Thank you very much! Best, Salvatore