/usr/share/gromacs/top/edissoc.dat is in gromacs-data 2018.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | C O 743
C OA 360
C OM 551
C C 348
C H 412
C N 305
C S 259
C CB 348
CB CB 480
CR5 CR5 480
CR6 CR6 480
NR5 CR5 459
N H 388
O H 463
S S 264
|