Main-sequence stellar population breakdown for different Galactic latitudes. The Galactic longitude on the left panel is ℓ = 0° (towards the centre of the disk) and the right panel ℓ = 180° (Galactic anti-centre). The bin of massive stars (>1.5 M⊙) is not visible as it represent less than 0.2%. We stress the different behaviour of the binary fraction for massive stars (blue vs. green bins) for the opposite directions in Galactic longitude.
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