Dear yt users,

Hi, I want to know about particle filters. I learned that I can specify some particle type by doing like this:

def stars(pfilter, data):
    filter = data[(pfilter.filtered_type, "particle_type")] == 2
    return filter

I learned that the filter for star is No.2 from this example. What about other particles like gas or dark matter ? (Nathan kindly told me that dark matter is 0, but fragmentary information I got from google search suggest that it's 1, so I'm confused...) Is there any good documentation for this?
I'm working with Enzo data.