This file is indexed.

/usr/lib/R/site-library/minpack.lm/INDEX is in r-cran-minpack.lm 1.2-1-3.

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

The actual contents of the file can be viewed below.

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nls.lm                  Addresses NLS problems with the
                        Levenberg-Marquardt algorithm
nls.lm.control          Control various aspects of the
                        Levenberg-Marquardt algorithm