Fig. 4
Overlay of CO(3–2) contours on the (F606W) HST image. The color scale is linear, in arbitrary units. Notice the perfect coincidence between the emergent spiral arm in CO(3–2) and the dust extinction in the NW. CO contours are linear from 0.04 to 17.44 in steps of 0.87 Jy/beam km s-1. The first contours of the CO(3–2) emission are drawn in yellow to be visible against the dark dust lane.
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