Fig. 2.
E-MILES single stellar population (SSP) synthesis models. The g − r colours versus metallicity (left panel) and M/L ratio (right panel) predicted by the SSP models (coloured points) corresponding to different ages, indicated by the colour bars to the right, are shown. The solid black line indicates the integrated colour measured for UDG 32, and the two dashed lines correspond to the 1σ error.
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