This file is indexed.

/usr/share/gromacs/top/gromos53a5.ff/watermodels.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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spc    SPC    simple point charge, recommended
spce   SPC/E  extended simple point charge