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Fig. 16.


Masers (dots) and the fit to the spiral arms (solid lines) from Reid et al. (2019) are over-plotted on top of our density map (same as Fig. 11). The maser distances were computed by naively inverting the parallax. The dashed circles have radii from 1 to 6 kpc, in steps of 1 kpc. The shaded regions correspond to the arm width. Different colours correspond to different spiral arms: Outer, green; Perseus, grey; Local, pink; Sagittarius-Carina, purple; Scutum-Centaurus, orange.

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