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Fig. 5.

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Bulge CMD used to fit the extinction. The central isochrone with (age,[Fe/H]) = (11 Gyr, 0.0) should match the mean bulge CMD. The redder right isochrone with (age,[Fe/H]) = (14 Gyr, +0.4) should be the limit of the reddest RGB stars and the left isochrone with (age,[Fe/H]) = (14 Gyr, −1.0) should be the blue limit for main sequence and RGB. The cyan isochrone indicates a shorter distance and younger age to match a probable contamination from foreground disc stars in the bright blue region of all CMDs.

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