/usr/lib/R/site-library/viridis/INDEX is in r-cran-viridis 0.5.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | scale_color_viridis Viridis color scales
viridis.map Original 'viridis'and 'cividis' color map
viridis_pal Viridis palette (discrete)
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