This file is indexed.

/usr/lib/R/site-library/gam/INDEX is in r-cran-gam 1.14-1.

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

The actual contents of the file can be viewed below.

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gam		Fit a generalized additive model
lo		local regression wrapper to be used in a gam formula
s		smoothing spline wrapper to be used in a gam formula
plot.gam	an interactive plotting function for gams
predict.gam	make predictions from a gam object
step.gam	stepwise model search with gam
anova.gam	compare the fits of a number of gam models
summary.gam	summary method for gam
preplot.gam     extracts the components from a gam in a plot-ready form
gam.lo		local regression smoother for gam, used by all.wam
gam.s		smoothing spline smoother for gam,used by all.wam
na.gam.replace	a missing value method that is helpful with gams
gam.exact	a wrapper for semiparametric gams producing exact standard errors
gam.control	control parameters for fitting gam models