Fig. E.1.
YSO groups and masers (same symbols as Fig. 3) overplotted on the 3D dust reddening map from Green et al. (2019), integrated from z = −300 pc to 300 pc. The YSO groups follow a dust feature in the reddening map with a similar pitch angle. The dust map is truncated by the limits of the Pan-STARRS survey (bottom edge) and by our |ℓ| < 30° limits in this Letter (top edge).
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