Fig. 7
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Positions of the final literature sample of background stars with spectroscopically measured 3 μm optical depths, overlaid on a Planck 857 GHz (350 μm) image of the Milky Way. Different symbols (colors and shapes) indicate the data source, as detailed in Table 1. The sample spans more than 180 deg in Galactic longitude, covering a diverse set of nearby star-forming regions.
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