Colour distribution of the GCs within (subset 3 in Table 3). The thin solid curve is the Gaussian kernel density estimate for a bandwidth of 0.075 mag (same as the bin width of the histogram). The thick solid curve is the one-component model (“X”), and the short-dashed curve is the unequal-variance 2-component model (“V”). The two components are shown with long-dashed curves, the corresponding peaks are indicated by the long-dashed vertical lines. For comparison, the thick grey line shows the kernel density estimate for the colour distribution of the GCs with (number 2 in Table 3), and the arrows mark the positions of the peaks. For reference, the colour used to separate blue from red GCs (, D+05) is shown as solid vertical line.
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