# Color Science: Concepts and Methods, Quantitative Data and Formula
# Günter Wyszecki and Walter Stanley Stiles
# 2nd ed, Wiley-Interscience
# Table 2 (5.4.1)
x y ra rb theta
0.160 0.057 0.85 0.35  62.5
0.187 0.118 2.20 0.55  77.0
0.253 0.125 2.50 0.50  55.5
0.150 0.680 9.60 2.30 105.0
0.131 0.521 4.70 2.00 112.5
0.212 0.550 5.80 2.30 100.0
0.258 0.450 5.00 2.00  92.0
0.152 0.365 3.80 1.90 110.0
0.280 0.385 4.00 1.50  75.5
0.380 0.498 4.40 1.20  70.0
0.160 0.200 2.10 0.95 104.0
0.228 0.250 3.10 0.90  72.0
0.305 0.323 2.30 0.90  58.0
0.385 0.393 3.80 1.60  65.5
0.472 0.399 3.20 1.40  51.0
0.527 0.350 2.60 1.30  20.0
0.475 0.300 2.90 1.10  28.5
0.510 0.236 2.40 1.20  29.5
0.596 0.283 2.60 1.30  13.0
0.344 0.284 2.30 0.90  60.0
0.390 0.237 2.50 1.00  47.0
0.441 0.198 2.80 0.95  34.5
0.278 0.223 2.40 0.55  57.5
0.300 0.163 2.90 0.60  54.0
0.365 0.153 3.60 0.95  40.0