Optimal color solid for illuminant CIE FL4 in the CIE xyY color space
<a href="//commons.wikimedia.org/wiki/User:Adoniscik" title="User:Adoniscik">Adoniscik</a>
CC BY 3.0
Cropped and made transparent from <a href="//commons.wikimedia.org/wiki/File:Optimalfarbk%C3%B6rper_CIE1931_y5-y95-illuminant_f4-100dpi.gif" title="File:Optimalfarbkörper CIE1931 y5-y95-illuminant f4-100dpi.gif">Albedoshader's version</a>