Fig. 12
Extinction measurements for Galactic O stars plotted on top of the full-sky Hα image of Finkbeiner (2003). Different colors are used for five ranges of R5495 with the size of the symbol increasing with E(4405 − 5495). The background image is showed in a logarithmic intensity scale and in Galactic coordinates with a Cartesian projection centered on the Galactic anticenter.
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