/usr/lib/R/site-library/gridExtra/INDEX is in r-cran-gridextra 2.3-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | arrangeGrob Arrange multiple grobs on a page
gridExtra-package Miscellaneous Functions for "Grid" Graphics
gtable_combine Combine gtables based on row/column names.
gtable_rbind rbind gtables
ngonGrob Regular polygon grob
tableGrob Graphical display of a textual table
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