A: L*(dark/light) a*(red) b*(yellow) values (hair colour) plotted in 3D colour space. The observer report of hair colours were categorised as black (△), brown (€), blonde (+), red (X) and auburn (O). B: Box plot of a* distribution among males and females. Significant deviation of the means was calculated using ANOVA.
Mengel-From et al. BMC Genetics 2009 10:88 doi:10.1186/1471-2156-10-88