This file is indexed.

/usr/lib/R/site-library/affyio/INDEX is in r-bioc-affyio 1.44.0-1.

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

The actual contents of the file can be viewed below.

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check.cdf.type          CDF file format function
get.celfile.dates       Extract Dates from CEL files
read.cdffile.list       Read CDF file into an R list
read.celfile            Read a CEL file into an R list
read.celfile.header     Read header information from cel file
read.celfile.probeintensity.matrices
                        Read PM or MM from CEL file into matrices