MAF settings in Power FC Commander

[JDMSIL80]

Im referring to the MAF sensor menus in the PFC Comander.

After you select the correct MAF, the screen shows you 8 different voltage and percentage settings as follow:

1. 0.64V 100.0%2. 1.28V 100.0%3. 1.72V 100.0%4. 2.56V 100.0%5. 3.20V 100.0%6. 3.82V 100.0%7. 4.48V 100.0%8. 5.12V 100.0%

The percentage for each voltage can be adjusted between 0 to 200%. What do these percentage numbers stand for? and how do I go about it changing the values for my tunning??