[yt-users] CLARIFICATION ON FIELD TYPES

Hi yt-users,

I am a newbie in using YT. I read through the documentation of field types but I still have some confusion in understanding when to use different field types, as in:

(1) 'io' vs 'all' (from what I understand, both are used for particles but I don't get the minute difference) (2) 'ramses' vs 'index' vs 'gas' (fluids described on the grid, I suppose?)

It would be really helpful if someone could provide an elaborate explanation on these.