This file is indexed.

/usr/share/gwyddion/gradients/Rainbow1 is in gwyddion-common 2.44-1.

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

The actual contents of the file can be viewed below.

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Gwyddion resource GwyGradient
0 0 0 0 1
0.125 1 0 0 1
0.25 1 1 0 1
0.375 0 1 1 1
0.5 1 0 1 1
0.625 0 1 0 1
0.75 0 0 1 1
0.875 0.5 0.5 0.5 1
1 1 1 1 1