This file is indexed.

/usr/lib/R/site-library/misc3d/INDEX is in r-cran-misc3d 0.8-4-2.

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

The actual contents of the file can be viewed below.

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computeContour3d        Compute Isosurface, a Three Dimension Contour
contour3d               Draw an Isosurface, a Three Dimension Contour
                        Plot
drawScene               Rendering of Triangular Mesh Surface Data
exportScene             Writing Out Triangular Mesh Scenes
image3d                 Draw Points on a 3D Grid
kde3d                   Compute a Three Dimension Kernel Density
                        Estimate
linesTetrahedra         Create a Set of Lines with Tetrahetra Centered
                        at Points along the Lines
makeTriangles           Triangle Mesh Functions
parametric3d            Draw a 3D Parametric Plot
perspLighting           Lighting Functions
pointsTetrahedra        Create a Set of Tetrahetra Centered at Data
                        Points
slices3d                Interactive Image Slices of 3D or 4D Volume
                        Data
surfaceTriangles        Create a Triangle Mesh Representing a Surface
teapot                  Utah Teapot