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/usr/share/radiance/stdrefl.cal is in radiance-materials 4R1+20120125-1.1.

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The actual contents of the file can be viewed below.

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{
	The following was generated by the command:

	tabfunc -i rho1 rho2 rho3 rho4 rho5 rho6 rho7 rho8 < radfactor.dat

	Used by scripts illumcal, reflcal.
}
interp_arr`(x,f)=if(x-1,if(f(0)-x,interp_arr2`(floor(x),x,f),f(f(0))),f(1));
interp_arr2`(i,x,f)=(i+1-x)*f(i)+(x-i)*f(i+1);
rho1(x)=interp_arr`((x-380)/10+1,rho1`p2810);
rho1`p2810(i)=select(i,0.219,0.252,0.256,0.252,0.244,
0.237,0.23,0.225,0.22,0.216,0.214,0.216,0.223,0.226,0.225,
0.227,0.236,0.253,0.272,0.298,0.341,0.39,0.424,0.442,0.45,
0.451,0.451,0.45,0.451,0.453,0.455,0.458,0.462,0.464,0.466,
0.466,0.467,0.467,0.467,0.467,0.467);
rho2(x)=interp_arr`((x-380)/10+1,rho2`p2810);
rho2`p2810(i)=select(i,0.07,0.089,0.111,0.118,0.121,
0.122,0.123,0.127,0.131,0.138,0.15,0.174,0.207,0.242,0.26,
0.267,0.272,0.282,0.299,0.322,0.335,0.341,0.342,0.342,0.341,
0.339,0.338,0.336,0.334,0.332,0.331,0.329,0.328,0.326,0.324,
0.324,0.322,0.32,0.316,0.315,0.314);
rho3(x)=interp_arr`((x-380)/10+1,rho3`p2810);
rho3`p2810(i)=select(i,0.065,0.07,0.073,0.074,0.074,
0.073,0.073,0.074,0.077,0.085,0.109,0.148,0.198,0.241,0.278,
0.339,0.392,0.4,0.38,0.349,0.315,0.285,0.264,0.252,0.241,0.229,
0.22,0.216,0.219,0.23,0.251,0.288,0.34,0.39,0.431,0.46,0.481,
0.493,0.5,0.505,0.516);
rho4(x)=interp_arr`((x-380)/10+1,rho4`p2810);
rho4`p2810(i)=select(i,0.074,0.093,0.116,0.124,0.128,
0.135,0.144,0.161,0.186,0.229,0.281,0.332,0.37,0.39,0.395,
0.385,0.367,0.341,0.312,0.28,0.247,0.214,0.185,0.169,0.16,
0.154,0.151,0.148,0.148,0.151,0.158,0.165,0.17,0.17,0.166,
0.164,0.168,0.177,0.185,0.192,0.197);
rho5(x)=interp_arr`((x-380)/10+1,rho5`p2810);
rho5`p2810(i)=select(i,0.295,0.31,0.313,0.319,0.326,
0.334,0.346,0.36,0.381,0.403,0.415,0.419,0.413,0.403,0.389,
0.372,0.353,0.331,0.308,0.284,0.26,0.232,0.12,0.194,0.185,0.18,
0.176,0.175,0.175,0.18,0.186,0.192,0.199,0.199,0.196,0.195,
0.197,0.203,0.208,0.215,0.219);
rho6(x)=interp_arr`((x-380)/10+1,rho6`p2810);
rho6`p2810(i)=select(i,0.151,0.265,0.41,0.492,0.517,
0.531,0.544,0.556,0.554,0.541,0.519,0.488,0.45,0.414,0.377,
0.341,0.309,0.279,0.253,0.234,0.225,0.221,0.22,0.22,0.223,
0.233,0.244,0.258,0.268,0.278,0.283,0.291,0.302,0.325,0.351,
0.376,0.401,0.425,0.447,0.469,0.485);
rho7(x)=interp_arr`((x-380)/10+1,rho7`p2810);
rho7`p2810(i)=select(i,0.378,0.524,0.551,0.559,0.561,
0.556,0.544,0.522,0.488,0.448,0.408,0.363,0.324,0.301,0.283,
0.265,0.257,0.259,0.26,0.256,0.254,0.27,0.302,0.344,0.377,0.4,
0.42,0.438,0.452,0.462,0.468,0.473,0.483,0.496,0.511,0.525,
0.539,0.553,0.565,0.575,0.581);
rho8(x)=interp_arr`((x-380)/10+1,rho8`p2810);
rho8`p2810(i)=select(i,0.104,0.17,0.319,0.462,0.49,
0.482,0.462,0.439,0.413,0.382,0.352,0.325,0.299,0.283,0.27,
0.256,0.25,0.254,0.264,0.272,0.278,0.295,0.348,0.434,0.528,
0.604,0.648,0.676,0.693,0.705,0.712,0.717,0.721,0.719,0.725,
0.729,0.73,0.73,0.73,0.73,0.73);