/usr/share/radiance/winxmit.cal is in radiance-materials 4R1+20120125-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | {
winxmit.cal - window transmittance function.
4/24/86
}
winxmit = 1.018 * Rdot * (1 + (1 - Rdot*Rdot)^1.5);
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