This file is indexed.

/usr/lib/R/site-library/deldir/INDEX is in r-cran-deldir 0.0-22-1.

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

The actual contents of the file can be viewed below.

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deldir                  Delaunay triangulation and Dirichlet
                        tessellation
duplicatedxy            Determine duplicated points.
plot.deldir             Plot objects produced by deldir
plot.tile.list          Plot Dirchlet (Voronoi) tiles
plot.triang.list        Plot Delaunay triangles
tile.centroids          Compute centroids of Dirchlet (Voronoi) tiles
tile.list               Create a list of tiles in a tessellation
triMat                  Produce matrix of triangle vertex indices.
triang.list             Create a list of Delaunay triangles