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Fig. 5


Relationship between molecular gas and atomic gas deficiency for spiral galaxies 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. 1. The horizontal dotted lines show the one-sigma dispersion of H2-deficiency parameter as determined from the calibrating relations given in Fig. 2.

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