This file is indexed.

/usr/share/gwyddion/glmaterials/Black-Rubber is in gwyddion-common 2.38-2.

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 GwyGLMaterial
0.02 0.02 0.02 1.0
0.01 0.01 0.01 1.0
0.4 0.4 0.4 1.0
0.0 0.0 0.0 1.0
.078125