Fig. A.2.
Projected Rayleigh statistic (V) corresponding to the orientation of the filamentary structures identified in the 2° × 2° tiles and across velocity channels in the MWISP CO survey with detection thresholds I > 3σI (left) and I > 5σI (right). The overlaid curves correspond to selected spiral arms from the model presented in Reid et al. (2016).
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