This file is indexed.

/usr/share/gromacs/top/specbond.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.

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CYS	SG	1	CYS	SG	1	0.2	CYS2	CYS2
CYS	SG	1	HEM 	FE	2	0.25	CYS2	HEME
CYS	SG	1	HEM 	CAB	1	0.18	CYS2	HEME
CYS	SG	1	HEM 	CAC	1	0.18	CYS2	HEME
HIS	NE2	1	HEM 	FE	1	0.2	HIS1	HEME
MET	SD	1	HEM 	FE	1	0.24	MET	HEME
CO      C       1       HEME    FE      1       0.19    CO      HEME
CYM     SG      1       CYM     SG      1       0.2     CYS2    CYS2