Relationship between molecular gas and stellar mass (in solar units) when the molecular gas mass is determined assuming a constant XCO factor (a), left) or the luminosity-dependent XCO factor given in Boselli et al. (2002) (b), right) for the subsample of galaxies observed by Kuno et al. (2007). Filled symbols indicate objects with a normal Hi gas content (Hi − def ≤ 0.4), empty symbols Hi-deficient objects (Hi − def > 0.4). The typical error bars on the data is given in panel a. The big cyan filled squares indicate the mean values for unperturbed systems (Hi − def ≤ 0.4), while the cyan empty squares the mean values for Hi-deficient objects. The big blue filled and empty circles show the mean values determined for the whole HRS sample for unperturbed and Hi-deficient objects, respectively The red dashed line indicates the linear fit determined using all gas-rich galaxies (Hi − def ≤ 0.4; red filled squares), the black solid and dotted lines the best fit determined for the whole HRS sample for Hi-normal and Hi-deficient galaxies, respectively.
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