Fig. 9
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Distribution of the most massive clouds from SEDIGISM (SED, coloured circles) ATLASGAL HMSF (AG HMSF) clumps (purple dots and crosses, from Urquhart et al. 2018) and Gaia distribution of OB stars (grey contours, from Xu et al. 2021), overlaid with the spiral arm location from TC93 models. Local spur parameters are taken from Reid et al. (2019). Other symbol conventions follow Fig. 2 (top panels).
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