/usr/share/gwyddion/gradients/Spectral-white is in gwyddion-common 2.50-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | Gwyddion resource GwyGradient
0 1 1 1 1
0.090909 0.940093 0.141772 0.135225 1
0.181818 1 0.534417 0 1
0.272727 0.875059 0.840787 0.022034 1
0.363636 0.496666 0.898024 0.0742046 1
0.454545 0.307927 0.782269 0.316396 1
0.545455 0.281147 0.741558 0.76144 1
0.636364 0.019608 0.529412 0.819608 1
0.727273 0.0775921 0.114046 0.778973 1
0.818182 0.388235 0.007843 0.678431 1
0.909091 0.664988 0.21297 0.667338 1
1 1 1 1 1
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