This file is indexed.

/usr/lib/R/site-library/mapdata/INDEX is in r-cran-mapdata 2.2-2-1.

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

The actual contents of the file can be viewed below.

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china                   China Map
japan                   Japan Map
nzHires                 New Zealand Map
rivers                  World Rivers Map Database
world2Hires             Pacific Centric World Map
worldHires              World Map