This file is indexed.

/usr/share/gromacs/top/charmm27.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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tip3p   TIP3P   TIP 3-point, recommended
tip4p   TIP4P   TIP 4-point
tips3p  TIPS3P  CHARMM TIP 3-point with LJ on H's
tip5p   TIP5P   TIP 5-point (see http://redmine.gromacs.org/issues/1348 for issues)
spc     SPC     simple point charge
spce    SPC/E   extended simple point charge