Dust de-reddened J-PLUS colour–colour diagrams of MS (left panels) and GB stars (right panels). From top to bottom: (u − g)0 vs. (g − r)0; (J0430 − J0861)0 vs. (u − J0378)0; (J0395 − J0515)0 vs. (r − J0660)0. The colour scale shows the density of sources, increasing from blue to red. The J-PLUS colours from the synthetic photometry of the Pickles (1998) empirical library are shown as grey symbols (squares for luminosity class V and triangles for luminosity class III). The location of low-metallicity halo stars and blue horizontal branch (BHB) stars is marked with a black line in the upper and middle left panels.
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