/usr/share/freemat/help/text/gray.mdc is in freemat-help 4.0-5.
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 | GRAY GRAY Gray Colormap
Usage
Returns a gray colormap. The syntax for its use is
y = gray
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