This file is indexed.

/usr/share/plplot5.10.0/cmap1_gray.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 rgb
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0.0   0.0   0.0   0.0   1.0 0
1.0   1.0   1.0   1.0   1.0 0