Providing information about "CIE(xy)" and "CIE(u'v')" or their applications in optics

The CIE(xy) and CIE(uv) plots are plots of the CIE Tristimulus Values used in the field of Colorimetry. For more information, see:

http://cie.co.at/ https://en.wikipedia.org/wiki/CIE_1931_color_space
http://www.cs.rit.edu/~ncs/color/a_chroma.html