This file is indexed.

/usr/lib/R/site-library/deldir/INDEX is in r-cran-deldir 0.1-12-1.

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
divchain                Dividing chain; generic.
divchain.default        Dividing chain; default method.
divchain.deldir         Dividing chain; "deldir" method.
duplicatedxy            Determine duplicated points.
plot.deldir             Plot objects produced by deldir
plot.divchain           Plot a dividing chain.
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
tilePerim               Calculate tile perimeters.
triMat                  Produce matrix of triangle vertex indices.
triang.list             Create a list of Delaunay triangles