Empirical colour vs. G−Ks calibrations for B−Ks, G−J, g−r and g−i colour indices. The dash-dotted lines correspond to our calibration at fixed metallicities (see legend). The colour of the points varies as a function of the metallicity. Diamonds correspond to the outliers removed at 3σ during the MCMC process. At the bottom of each calibration plot the residuals of the fit as a function of G−Ks and [Fe/H] are shown. All plots are scaled to the same G−Ks colour and metallicity intervals.
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