This file defines NPCs reaction modifier associated to the CRE reputation value.
First row is the PC's/NPC's reputation.
2nd row is the reaction modifier of the other NPC's that have interaction with PC/NPC with reputation from first column
In BG2 ToB we have:

2DA V1.0
0
  1   2  3  4  5  6  7  8  9  10 11 12 13 14 15 16 17 18 19 20
1 -20 -7 -6 -5 -4 -3 -2 -1 0  0  0  0  0  1  1  2  2  3  3  4