Variable "AR" in the skill formulas

[ElectriX3]

Hello,
I was wondering if someone knows, what does the variable AR mean? It is the part of spell dmg formulas in skill_proto on the server side, as well as the skilltable.txt clientside.

Example (ritual of a doom):

-(30+ 2*lv + 2*iq+(7*iq + 6*mwep + number(200,500))*ar*k)

I have done a bit of research and now I know, that it is highly influented by dexterity (until 90 points reached) and level of character. It always has a value <= 1,00. I searched down whole decompiled client to get further information about it, but without any success. I'll be very grateful for ANY kind of information, that will help me to solve this.

Thank you very much in advance.

EDIT 9.2.2012: Solved, PM for more info (or here)