What is BPW offset vs BPW in $88?

In $88, there is a BPW vs pump volts, that i think is the same as low bpw vs volts in $24. My question is:
What is Bpw vs bpw (f94) table in $88? Is it some kind of adder? I'm looking at these table because i can't get my idle blms up and i think these may be my problem.
Ron

It's an adder. See here. If gets into too much detail post back here for help.

Thanks. I checked out that article and explained exactly what i needed to know. I understand it's operation now.