Fig. 16
Comparison between (center) the map of the total equivalent width of the 4428 Å DIB, and (left) the Spitzer 70-μm image of dust emission (Meixner et al. 2006) and (right) an optical composite where blue is the B-band, green is the V-band plus [O iii] and red is Hα (credit: ESO). The four most conspicuous star clusters are marked and labelled.
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