This file is indexed.

/usr/lib/R/site-library/dichromat/INDEX is in r-cran-dichromat 1:2.0-0-1.

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

The actual contents of the file can be viewed below.

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colorschemes            Color Schemes
dalton                  Effects of Daltonism (Red-Green Color
                        Blindness)
dichromat               Remove Red-Green or Green-Blue Contrasts from
                        Colors