Fig. 7
Four galaxies which show asymmetric regions of decreased star formation efficiency. Left panels: star formation timescale 
. Greyscale levels are (1,10,20,30,40,50,60,70,80,90,100) 10 Myr. Right panels: spectral index distribution between 4.8 GHz and 1.4 GHz (NGC 4501 and NGC 4654 from Vollmer et al. 2010; NGC 4522 from Vollmer et al. 2004b). The greyscale levels are from 0.5 to 2.0 in steps of 0.1. The additional contour corresponds to a spectral index of 0.8.
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