This file is indexed.

/usr/share/plplot5.10.0/tcl/cmap1a.pal is in plplot-tcl 5.10.0+dfsg2-0.1ubuntu2.

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

The actual contents of the file can be viewed below.

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#5500ff 00
#010005 44
#050000 55
#ff0000 100