Fig. 6
Total number of FGK stars (upper panel) and M stars (lower panel) with habitable terrestrial planets, but no gas giants, as functions of the Galactocentric distance and the Galactic time (the N⋆ life quantity in Eq. (6)) where SN destructive effects are taken into account. The number of stars is computed within concentric rings that are 2 kpc wide.
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