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LOOT_MULT is how much gold they take if they occupy a province. I'm not sure of the exact formula, but the higher this is, the more gold you'll get when defeating barbarians that have looted.

I've fiddled with the others and never really noticed a difference anywhere, so can't tell you. CONQUER_LOSS should probably be the amount of people lost when the province changes hands, but I distinctly remember changing it to no effect.
 
Come to think of it, I think BARBARIANS_TO_POWERFUL is the limit for when you can settle a province, so if barb power is over this, you can't send colonists.
 
Ah. Well, don't know then. I originally thought it was the number of pop under which barbarians would empty out a province, but tests say its not.