Relationship between molecular gas and atomic gas deficiency for spiral galaxies mapped in CO by Kuno et al. (2007) (red symbols) when the molecular gas mass is determined assuming a constant XCO factor (panel a)) or the luminosity-dependent XCO factor given in Boselli et al. (2002) (panel b)). Symbols are as in Fig. 3. The red dashed line shows the bisector fit (the parameters of the fit are given in Table 4). The horizontal dotted lines show the one-sigma dispersion of H2-deficiency parameter as determined from the calibrating relations given in Fig. 3.
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