This file could define how charisma affects store prices. The values go up to 40, whereas chariama is usually capped at 25.
In IWD2 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     21     22     23     24     25     26     27     28     29     30     31     32     33     34     35     36     37     38     39     40
CHRMod     15     12     12     9      9      6      6      3      3      0      0      -3     -3     -6     -6     -9     -9     -12    -12    -15    -15    -18    -18    -21    -21    -24    -24    -27    -27    -30    -30    -33    -33    -36    -36    -39    -39    -42    -42    -45