Hi!!!
Your question is very vague:
– which vendor ?
– you want the counters formulas ?
– the definition of an indicator is just trying to describe a mathematical formula with words. Depending on your level of expertise, it can be very long to explain (what is a tch allocation, what is a tch drop, etc…)
and you will find lots of related answers in older posts.
please try to have a look
regards
pix