PM-selected CMDs in different filter combinations with superimposed a solar-scaled isochrone with t = 13 Gyr and [Fe/H] = −2.27 from the BaSTI database and the corresponding ZAHB. The three panels on the left-hand side show, from top to bottom, the rSloan , BBessel and Uspec magnitudes vs. BBessel − rSloan colour, the middle panels show the magnitudes vs. Uspec − BBessel colour, and the right panels the magnitudes vs. Uspec − rSloan colour. Symbols are the same as in the Fig. 8.
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