Fig. 4
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Similar to Fig .2, but showing the distribution of distances (from ALS, see Sect. 3.2). A vertical dashed line indicates the 3000 pc limit used as a quality cut (see Appendix A for explanation). The large concentration of stars missing in the IACOB spectroscopic database at ~1600 pc corresponds to relatively highly extinguished O-type stars in the Cygnus OB2 region (see Berlanas et al. 2020).
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