This file is indexed.

/usr/lib/R/site-library/fNonlinear/INDEX is in r-cran-fnonlinear 3042.79-1.

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

The actual contents of the file can be viewed below.

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NonLinModelling         Chaotic Time Series Modelling
NonLinStatistics        Chaotic Time Series Statistics
NonLinTests             Time Series Tests