Fig. 2.
Position of stellar spectra by Pickles (1998) in colour–colour diagrams for different levels of interstellar reddening. Top panel: region of the BP−RP versus BP−G diagram considered in Sect. 5. The colour–colour diagram is rotated clockwise by 30◦ and exaggerated in the vertical direction by a factor 11. The dashed lines correspond to constant BP−RP and BP−G values. Left panel: red-end region of the BP−G versus G–RP diagram used in Sect. 6.
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