/usr/share/radiance/rgb.cal is in radiance-materials 4R0+20110410-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | red(x, y) : 1.73*x - 0.48*y - 0.26*(1 - x - y) ;
green(x, y) : -0.81*x + 1.65*y - 0.02*(1 - x - y) ;
blue(x, y) : 0.08*x - 0.17*y + 1.28*(1 - x - y) ;
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