Fig. 9.
Binned mean velocity integrated optical depth of the sample (thin bars) in comparison to the Milky Way: the data from each of the Canadian Galactic Plane Survey (CGPS, Taylor et al. 2003), the Southern Galactic Plane Survey (SGPS, McClure-Griffiths et al. 2005) and the VLA Galactic Plane Survey (VGPS, Stil et al. 2006) are shown as points, with the thick bars showing the binned values.
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