Fig. 2
Velocity with respect to the LSR as a function of the Galactic longitude for the simulated 6.7 GHz methanol masers distribution. The point size is a measure of the peak luminosity function (Sect. 2.5). Masers associated with different spiral arms are color-coded as in Fig. 1. The figure is overlaid on the CO emission (J = 1−0) plotted in grayscale and taken from Dame et al. (2001).
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