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Fig. 5.


v diagram for objects in the new structure. Groups associated with single velocity peaks are filled symbols, while ambiguous cases are open symbols with dashed lines connecting plausible vlsr solutions. The shape indicates the survey used to determine the vlsr: SEDIGISM (circle), FUGIN (square), and COGAL (triangle). Masers are plotted as magenta “x” marks. The underlying image is the Dame et al. (2001) COGAL map integrated over |b|≤3°, with the loci of the Sagittarius Arm (orange line) and Scutum Arm (blue line) from Reid et al. (2016). Each YSO group in the structure has a possible solution consistent with the Sagittarius Arm.

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