/usr/share/radiance/climit.cal is in radiance-materials 4R1+20120125-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | { Avoid zero pixel values }
lim_r(r,g,b) = if(grey(r,g,b)-.01, min(r,1), A1);
lim_g(r,g,b) = if(grey(r,g,b)-.01, min(g,1), A2);
lim_b(r,g,b) = if(grey(r,g,b)-.01, min(b,1), A3);
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