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Fig. 3. Relationship between UV and human-visible dichromatism. Geometric mean
regression of PCA estimates of dichromatism in the UV range (320–400 nm)
against human visual estimates (r2=0.25, N=960,
P<0.0001). PCA scores were calculated using spectrophotometer data
and human-visible scores are from the study of Dunn and colleagues
(Dunn et al., 2001). Scores
for each index were standardized to a mean of zero and a standard deviation of
one.
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