Consistency between and within subjects for each measured boundary.

The table on the left shows the measures obtained for chromatic boundaries and the table on the right for achromatic (Gr)-to-other-colours boundaries. Inter-observer variabilities were obtained by calculating the standard deviation of each observer from the mean (all observers). Similarly, intra-observer variabilities were obtained by calculating the standard deviation of each observer from its own mean (since each observer repeated the same experiment many times). Units correspond to CIE L*a*b* units (equivalent to a jnd).