This file is indexed.

/usr/lib/R/site-library/rgl/INDEX is in r-cran-rgl 0.92.798-1.

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

The actual contents of the file can be viewed below.

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addNormals              Add normal vectors to objects so they render
                        more smoothly.
aspect3d                Set the aspect ratios of the current plot
axes3d                  Draw boxes, axes and other text outside the
                        data
cylinder3d              Create cylindrical or "tube" plots.
ellipse3d               Make an ellipsoid
grid3d                  Add a grid to a 3D plot
matrices                Work with homogeneous coordinates
mesh3d                  3D Mesh objects
par3d                   Set or Query RGL Parameters
par3dinterp             Interpolator for par3d parameters
persp3d                 Surface plots
play3d                  Play animation of rgl scene
plot3d                  3D Scatterplot
points3d                add primitive set shape
r3d                     Generic 3D interface
rgl-package             3D visualization device system
rgl.bbox                Set up Bounding Box decoration
rgl.bg                  Set up Background
rgl.bringtotop          Assign focus to an RGL window
rgl.clear               scene management
rgl.light               add light source
rgl.material            Generic Appearance setup
rgl.pixels              Extract pixel information from window
rgl.postscript          export screenshot
rgl.primitive           add primitive set shape
rgl.setMouseCallbacks   User callbacks on mouse events
rgl.snapshot            export screenshot
rgl.spheres             add sphere set shape
rgl.surface             add height-field surface shape
rgl.texts               add text
rgl.user2window         Convert between rgl user and window coordinates
rgl.viewpoint           Set up viewpoint
select3d                Select a rectangle in an RGL scene
shapelist3d             Create and plot a list of shapes
spin3d                  Create a function to spin a scene at a fixed
                        rate
sprites3d               add sprite set shape
subdivision3d           generic subdivision surface method
surface3d               add height-field surface shape