Fig. 1
Six versions of all-sky maps of the average J − H (left frames) and H − K (right frames) colours. The first three are based on observed 2MASS sources (frames a)−c)) and the last three (frames d), f)) on stars simulated with the Besançon model. See text for details. The labels M1, M2a, and M2b refer to extinction maps where the corresponding data are used as reference colours.
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