[chirp_users] CHIRP field value doc

I am a bit confused. I think I have set all my channels to send a PL tone and to squelch unless the same tone is received. Some radios call these CT and RT. My CHIRP settings are: Tone Mode is Tone for all (except a couple of simplex channels), Tone and Tone SQL are set, Cross Mode is Tone->Tone I need a bit of doc for these fields. Here are some of my guesses:

Tone Mode: Tone means CT+RT, None means neither, TSQL means RT, DTCS means digital squelch(?), Cross means ????

Tone is CT frequency,

ToneSQL is RT frequency.

Cross Mode is ?????

Is this all written down somewhere in the Wiki???

Please help.