/usr/lib/R/site-library/rgl/demo/ is in r-cran-rgl 0.94.1143-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/R/site-library/rgl/demo/abundance.r
/usr/lib/R/site-library/rgl/demo/bivar.r
/usr/lib/R/site-library/rgl/demo/envmap.r
/usr/lib/R/site-library/rgl/demo/flag.R
/usr/lib/R/site-library/rgl/demo/hist3d.r
/usr/lib/R/site-library/rgl/demo/lollipop3d.R
/usr/lib/R/site-library/rgl/demo/lsystem.r
/usr/lib/R/site-library/rgl/demo/mouseCallbacks.R
/usr/lib/R/site-library/rgl/demo/regression.r
/usr/lib/R/site-library/rgl/demo/rgl.r
/usr/lib/R/site-library/rgl/demo/shapes3d.R
/usr/lib/R/site-library/rgl/demo/stereo.R
/usr/lib/R/site-library/rgl/demo/subdivision.r
/usr/lib/R/site-library/rgl/demodata/population.dat
/usr/lib/R/site-library/rgl/demodata/region.dat