This file is indexed.

/usr/share/gromacs/top/oplsaa.ff/aminoacids.n.tdb is in gromacs-data 5.0.2-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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[ None ]

[ GLY-NH3+ ]
[ replace ]
N		opls_287	14.0027	-0.3
CA		opls_292B	12.011	0.19
[ add ]
3	4	H	N	CA	C
	opls_290	1.008	0.33
[ delete ]
H

[ GLY-ZWITTERION_NH3+ ]
[ replace ]
N		opls_287	14.0027	-0.3
CA		opls_298	12.011	0.09
[ add ]
3	4	H	N	CA	C
	opls_290	1.008	0.33
[ delete ]
H

[ PRO-NH2+ ]
[ replace ]
N		opls_309	14.0027	-0.2
CA		opls_246	12.011	0.23
CD		opls_296	12.011	0.17
[ add ]
2	4	H	N	CA	C
	opls_310	1.008	0.31

[ PRO-ZWITTERION_NH2+ ]
[ replace ]
N		opls_309	14.0027	-0.2
CA		opls_246	12.011	0.13
CD		opls_296	12.011	0.17
[ add ]
2	4	H	N	CA	C
	opls_310	1.008	0.31

[ NH3+ ]
[ replace ]
N		opls_287	14.0027	-0.3
CA		opls_293B	12.011	0.25
[ add ]
3	4	H	N	CA	C
	opls_290	1.008	0.33
[ delete ]
H

[ ZWITTERION_NH3+ ]
[ replace ]
N		opls_287	14.0027	-0.3
CA		opls_299	12.011	0.15
[ add ]
3	4	H	N	CA	C
	opls_290	1.008	0.33
[ delete ]
H

[ GLY-NH2 ]
[ replace ]
N		opls_900	14.0027	-0.9
CA		opls_906B	12.011	0.06
[ add ]
2	4	H	N	CA	C
	opls_909	1.008	0.36
[ delete ]
H

[ PRO-NH ]
[ replace ]
N		opls_901	14.0027	-0.78
CA		opls_246	12.011	0.14
CD		opls_245	12.011	0.08
[ add ]
1	4	H	N	CA	C
	opls_910	1.008	0.38

[ NH2 ]
[ replace ]
N		opls_900	14.0027	-0.9
CA		opls_912B	12.011	0.12
[ add ]
2	4	H	N	CA	C
	opls_909	1.008	0.36
[ delete ]
H

[ PGLU-NH ]
[ replace ]
CA              opls_246        12.011  0.14