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CIE 1931 standard colorimetric observer
ideal observer whose colour-matching properties correspond to the CIE colour-matching functions 
adopted by the CIE in 1931
Note 1 to entry: This entry was numbered 845-03-31 in IEC 60050-845:1987.
Note 2 to entry: This entry was numbered 17-149 in CIE S 017:2011.