/usr/share/gromacs/top/encadv.ff/ffnonbonded.itp is in gromacs-data 4.6.5-1build1.
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 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 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | [ atomtypes ]
;name at.num mass charge ptype sigma epsilon
H 1 1.008 0.0 A 2.54129e-01 1.58992e-01
O 8 15.9994 0.0 A 2.76223e-01 7.73161e-01
N 7 14.0027 0.0 A 3.40065e-01 1.72862e+00
N1 7 14.0027 0.0 A 3.40065e-01 1.72862e+00
N2 7 14.0027 0.0 A 3.40065e-01 1.72862e+00
C1 6 12.011 0.0 A 3.84423e-01 3.08863e-01
C2 6 12.011 0.0 A 3.84423e-01 3.08863e-01
C3 6 12.011 0.0 A 3.84423e-01 3.08863e-01
CP 6 12.011 0.0 A 3.84423e-01 3.08863e-01
A6 6 12.011 0.0 A 3.75977e-01 1.57444e-01
A5 6 12.011 0.0 A 3.75977e-01 1.57444e-01
A7 6 12.011 0.0 A 3.75977e-01 1.57444e-01
Aprime 6 12.011 0.0 A 3.75977e-01 1.57444e-01
Abis 6 12.011 0.0 A 3.75977e-01 1.57444e-01
L5 7 14.0027 0.0 A 2.76223e-01 7.73161e-01
L6 7 14.0027 0.0 A 2.76223e-01 7.73161e-01
P 15 30.9738 0.0 A 3.84423e-01 3.08863e-01
OH 8 15.9994 0.0 A 3.16556e-01 7.73161e-01
O2 8 15.9994 0.0 A 3.16556e-01 7.73161e-01
OR 8 15.9994 0.0 A 3.16556e-01 7.73161e-01
S 16 32.060 0.0 A 3.84423e-01 3.08863e-01
SH 16 32.060 0.0 A 3.84423e-01 3.08863e-01
M1 7 14.0027 0.0 A 3.40065e-01 1.72862e+00
M2 7 14.0027 0.0 A 3.40065e-01 1.72862e+00
M3 7 14.0027 0.0 A 3.40065e-01 1.72862e+00
HN 1 1.008 0.0 A 4.45449e-02 4.18400e-02
HO 1 1.008 0.0 A 4.45449e-02 4.18400e-02
HW 1 1.008 0.0 A 4.45449e-02 4.18400e-02
CL 17 35.453 0.0 A 4.31068e-01 3.51456e-01
Obis 8 15.9994 0.0 A 2.76223e-01 7.73161e-01
OP 8 15.9994 0.0 A 2.76223e-01 7.73161e-01
R 7 14.0027 0.0 A 3.40065e-01 1.72862e+00
W 7 14.0027 0.0 A 3.40065e-01 1.72862e+00
Y 6 12.011 0.0 A 3.75977e-01 1.57444e-01
Z 6 12.011 0.0 A 3.75977e-01 1.57444e-01
FE 26 55.847 0.0 A 3.84423e-01 3.08863e-01
OF 8 15.9994 0.0 A 2.76223e-01 7.73161e-01
OW 8 15.9994 0.0 A 3.16556e-01 7.73161e-01
AR 18 39.948 0.0 A 2.54129e-01 1.58992e-01
NA 11 22.9898 0.0 A 2.40543e-01 7.73161e-01
MCH3 0 0.0 0.0 A 0.0 0.0
MNH3 0 0.0 0.0 A 0.0 0.0
MW 0 0.0 0.0 A 0.0 0.0
[ nonbond_params ]
; i j func c6 c12
; Encad uses strict combination rules, so no need for explicit parameters
[ pairtypes ]
; i j func cs6 cs12
; 1,4 interactions are calculated automatically, using fudge factors.
; (In the current version, the factors are 0.0, meaning no 1,4 interactions).
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