Fig. 7.
Comparison between the H I emission profile (top panel, red: Struve et al. 2010); CO emission profiles, inverted and in arbitrary units for ease of comparison (bottom panel, blue dotted: Prandoni et al. 2007; black dashed: O’Sullivan et al. 2015); and the WSRT H I absorption profile (bottom panel, red). The CO emission profile does not match the H I emission profile, implying that the CO emission does not arise from the molecular counterpart of the large H I disc. The H I absorption and the CO emission profiles match, implying that CO and absorbing H I are spatially coincident.
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