This file assigns the text descriptions for the defined reputation values from 0 to 20.
In BG2EE we have:

2DA V1.0
-1
        VALUE
0       10366
1       10366
2       10366
3       10366
4       10366
5       5687
6       5687
7       5687
8       5687
9       10368
10      10368
11      10368
12      10368
13      10370
14      10370
15      10370
16      10370
17      10387
18      10387
19      10387
20      10387

where first column is reputation value and the second one is the string reference in the Dialog.tlk file.
I have not tried to make more or less reputation levels, however I suppose it is totally possible to make as many of them as needed.