This file is indexed.

/usr/lib/R/site-library/labeling/INDEX is in r-cran-labeling 0.1-2.

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The actual contents of the file can be viewed below.

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extended                An Extension of Wilkinson's Algorithm for
                        Position Tick Labels on Axes...
extended.figures        Generate figures from An Extension of
                        Wilkinson's Algorithm for Position Tick Labels
                        on Axes...
gnuplot                 gnuplot's labeling algorithm...
heckbert                Heckbert's labeling algorithm...
labeling                Axis labeling
matplotlib              Matplotlib's labeling algorithm...
nelder                  Nelder's labeling algorithm...
rpretty                 R's pretty algorithm implemented in R...
sparks                  Sparks' labeling algorithm...
thayer                  Thayer and Storer's labeling algorithm...
wilkinson               Wilkinson's labeling algorithm...