This file is indexed.

/usr/lib/R/site-library/gmaps/INDEX is in r-cran-gmaps 0.2-2build1.

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

The actual contents of the file can be viewed below.

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USALevelPlot            USA Level Plot
colorfunctions          Color Functions
gradientLegendGrob      Gradient Legend Grobs
mapGrob                 Map grid graphics objects