However, the illuminants A and D66 were more ciroular on the CIE 1976 space, whereas D55 and D75 were more circular on the CIE 1960 diagram.

• 研究结果发现,CIE标准照明体A、D_(55)、D_(65)、D_(75)的匹配和允许范围在CIE1931色度图上都接近椭圆形。