Fig. 6
The three galaxies which show an enhanced molecular fraction at the windward side. Left panels: total gas surface density contours on the molecular gas fraction ΣH2/ΣHI. Greyscale levels are (1,2,4,8,16,32) × 0.1. Right panels: total gas surface density contours on the radio deficit region in greyscale (NGC 4330; from Murphy et al. 2009) or the 6 cm polarized radio continuum emission distribution (NGC 4501; from Vollmer et al. 2007; NGC 4522; from Vollmer et al. 2004b).
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