Fig. 7
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Distributions of H II regions overlaid with HMSFR masers (open triangles), O-type stars (blue dots, left panel), and YOCs (cyan dots, right panel). An equal size of the symbol is adopted for masers and O-type stars. The dot size for each YOC is proportional to the number of member stars as Hao et al. (2021). The H II regions and the positions of the Sun and GC are the same as Fig. 6.
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