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Table 2 Parameters of colour discrimination ellipses fits for a male Alouatta caraya and a female Alouatta seniculus

From: Uniform trichromacy in Alouatta caraya and Alouatta seniculus: behavioural and genetic colour vision evaluation

Subject Length (u’v’ unit) Ratio Angle (degree)
Male Alouatta caraya
 Ellipse 1 0.022158 1.2608 28.053
 Ellipse 2 0.022844 1.3323 138.134
 Ellipse 3 0.040704 2.7798 116.07
Female Alouatta seniculus
 Ellipse 1 0.043602 1.2659 130.95
 Ellipse 2 0.04284 1.241 101.06
 Ellipse 3 0.048058 1.5154 106.87
  1. Subjects were tested using an adaptation from Goulart et al. [24] colour vision test, for the Alouatta genus. Length = Major axis of the ellipses in u’v’units of CIE 1976 chromaticity diagram units, Ratio = major axis length over minor axis length, Angle = relative angle of the major axis in degrees