Fig. 1.
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Density distribution of the filtered sample of massive hot stars from Zari et al. (2021). In the left panel, the coloured lines represent the spiral arm locations derived by Reid et al. (2019). The right panel highlights the 6 × 6 kpc region considered in this study. Such region is divided in ‘spaxels’ of different sizes, each containing the same number of sources. In both panels, the Sun is in X, Y = (0, 0).
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