This file is indexed.

/usr/share/plplot5.10.0/cmap1_lowfreq.pal is in libplplot12 5.10.0+dfsg-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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v2 hls
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0.    240. 0.5 1.0 1. 0
0.499 240. 0.5 0.0 1. 0
0.501  60. 0.5 0.0 1. 0
1.     60. 0.5 1.0 1. 0