This file is indexed.

/usr/lib/R/site-library/mcmc/INDEX is in r-cran-mcmc 0.9-5-1.

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

The actual contents of the file can be viewed below.

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foo                     Simulated logistic regression data.
initseq                 Initial Sequence Estimators
logit                   Simulated logistic regression data.
metrop                  Metropolis Algorithm
morph                   Variable Transformation
morph.metrop            Morphometric Metropolis Algorithm
olbm                    Overlapping Batch Means
temper                  Simulated Tempering and Umbrella Sampling