Fig. 15
Contours of the dense gas mass fraction using two different thresholds overlaid on the integrated 13CO map. The regions with fraction f> 0.5 should be rapidly forming stars. The background image in both frames is the GRS 13CO image integrated over the range 40 km s-1<vlsr< 75 km s-1, masked to include only pixels with TB> 0.5 K.
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