Fig. 2.

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CMD Ks versus H − Ks. The blue and salmon coloured regions indicate the two target groups of stars with different reddening dominated on average by stars from the closest edge of the NSD (NSD outer region) and stars deeper inside the NSD (NSD inner region), respectively. The dashed boxes show the reference stars used to build the extinction maps for each of the stellar groups analysed (see Sect. 4.1). The black arrow indicates the reddening vector.
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