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/usr/share/gromacs/top/charmm27.ff/rna.c.tdb is in gromacs-data 4.5.5-2.

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

The actual contents of the file can be viewed below.

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[ 3' ]
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C3'	C3'	CN7	12.011 	   0.14	
H3'	H3'	HN7	1.008	   0.09
O3'	O3'	ON5	15.9994   -0.66
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1	2	H3T	O3'	C3'	C4'
		HN5     1.008     0.43	-1