Fig. 9
Massive stars within the Coalsack Loop. Hα emission is shown in red and H i 21-cm emission (− 24 km s-1 channel) is in blue. Left: symbol size is proportional to the stellar mass. Right: symbol size is proportional to the stellar age. The position of NGC 4755 is shown with a yellow circle outlined with black. See the electronic edition for a color version of the figure.
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