Smooth kinematic and metallicity gradients reveal that the Milky Way’s nuclear star cluster and disc might be part of the same structure

Open Access

Fig. 3.

CMDs K_s versus J − K_s and K_s versus H − K_s obtained for stars with well defined proper motions (i.e. proper motion uncertainties < 0.5 mas yr⁻¹). The red dashed boxes indicate the assumed colour cuts to analyse the variation of the proper motion distribution with respect to the extinction.

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