The ratio of each of the three tristimulus values to their sum.
Symbol: (Reference: C.I.E. 1931) x, y, z.
Reference: C.I.E. (extract)
Note: See the Note: to 2-1-475. For a field of vision of about 10 degrees the symbols are x10, y10, z10
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
Celsius (previously Centigrade)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM