is this a kissassist question? are you using kissassist?
/mapfilter CastRadius color 25 225 25 --- this makes a green circle for your cast radius as defined in kiss (this is your pullrange)
/squelch /mapfilter SpellRadius color 25 25 225 --- this makes a blue circle for your spell radius as defined in kiss (this is your maxradius)
mq2map has a few radii built in
CampRadius, PullRadius, SpellRadius
then there are other things that draw circles like target radius (draws a circle around your target)
but would need to know what stuff is making the circles to tell you what each color means (kiss, rgmercs, muleassist, etc)