This file is indexed.

/usr/lib/R/site-library/pheatmap/INDEX is in r-cran-pheatmap 1.0.8-1.

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

The actual contents of the file can be viewed below.

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pheatmap                A function to draw clustered heatmaps.
pheatmap-package        Pretty heatmaps