Spatial relation between the studied Galactic direction (dashed line) and the Vallée (2008) model with four arms. A distance to the Galactic center of 8.0 kpc was assumed. The yellow circle indicates the position of the Sun. Colored squares depict the three stellar populations discovered in this work (see Sect. 5.1). Other relevant stellar populations have been plotted as a reference: filled circles represent open clusters and young associations with optical UBVI data from several studies, and open circles indicate HII tracers (Hou et al. 2009).
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