Observational HR diagram for all stars in Gaia DR1 selected as explained in the text for which the (G−Ks) colour index can be calculated from Gaia DR1 and the data in the 2MASS Point Source Catalogue. The visualisation is the same as in Fig. 3 with the contours enclosing 10%, 30%, 50%, 70%, and 90% of the data.
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