This file defines the experience gap between each level, starting with level 21. Experience for lower levels are defined in XPLEVEL.2DA.

In PSTEE we have:

2DA V1.0
0
            XPGAP
MAGE        375000
FIGHTER     250000
PALADIN     300000
RANGER      300000
CLERIC      225000
DRUID       500000
THIEF       220000
BARD        220000