Does anyone know what the following tables do?

2692 IAC Adder - AC pressure -
OK That one seems obvious.
I was going to zero it out as the AFR guage is on the AC.... Don't want it opening IAC when we go lean right?

20CD ac Low Pressure charge vs table -
What does it do ?
WAS all 255 - Do I zero this out?

20DA ac low charge vs table - and this ?
20E7 ac low charge vs table - and this ?

TIA
Mitch