Difference between the G15 E(B − V) values and E(4405 − 5495) for the O stars with E(4405 − 5495) > 1.0 in the Cygnus-X region plotted on top of the CO J = 1 ← 0 map of Leung & Thaddeus (1992). The value is encoded in the color of each symbol (see scale on left panel and compare with the vertical axis of Fig. 5). The left panel shows the whole region while the right panel zooms in the blue rectangular region, which corresponds to Cyg OB2. The beam FWHM is 8.′7 (~4 pc at the distance of Cyg OB2), so the CO clouds are likely to have substructure not seen in the map. The angular resolution ofthe G15 values is similar to the beam size. The axes are in Galactic coordinates and the units are degrees.
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