Extinction measurements for O stars in four H II regions: (top left) the Carina Nebula, (top right) M 16/NGC 6611, (bottom left) Berkeley 59/NGC 7822, and (bottom right) Sharpless 2-132. The top two images are from ESO press releases 1250 (BgrHα) and 0926 (BV R), respectively. The bottom two images are RGB combinations of J2MASS+RDSS2+BDSS2. North is towards the top and east towards the left and the approximate physical scale is indicated in all cases. Only a section of each H II region is shown to better visualize the dust lanes.
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