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Left: The linear depth order for the pooled participants of cluster II, as a function of the hue index. The hues have also been indicated by their color. The boxes show the interquartile ranges, the dots the median value. Only the nonshaded region represents ecologically relevant hues. Right: The distribution of brightness. We used a linear luminosity function with relative weights R: G: B = 3: 6: 1 (Stokes, Anderson, Chandrasekar, & Motta, 1996), but this is not at all critical.
