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CMDs H vs. J − H and Ks vs. H − Ks for the central, transition, and inner bulge regions of the GALACTICNUCLEUS survey, from the upper to the lower panels, respectively. The colour code refers to stellar densities, using a power-stretch scale (different in each case to stress the spiral arm features). Cyan lines correspond to a PARSEC isochrone of 1 Gyr and [M/H = −0.07] according to the extinction and distance parameters obtained for the spiral arm. The blue and green error bars indicate the 1 σ uncertainties of the position of the isochrones and the photometric ZP, respectively. The zoomed-in region corresponds to the red clump features (e.g., Girardi 2016) from the inner Galactic bulge (‘1’ and ‘2’ associated to different extinctions from the IBS and IBS regions) and the overlap with the fourth spiral arm.
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