What Is The Analyst to Associate Promotion Package?

I have noticed there is no discussion on this site regarding the analyst to associate promotion comp structure.

Is there a bonus for the promotion, separate from your A2 performance bonus? I've heard some pretty contradicting things and was wondering if it is structured or if it is ad-hoc. MBA hires are $60K Sign-On + $150K Base + $50-100K stub so roughly 250-300k all in; A2A's should at least be matched, correct?

Examples I have heard that BB's are paying $100K "sign-on" for A2.5/A3's that are moving to AS1. I have also heard that A2A's are underpaid (less than $150K base), in which case- what gives?

I think this could be a very useful thread for those interested in staying on and not heading to PE/B-School. Thank you in advance.