Relationship between molecular gas and the optical surface of spiral galaxies 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). Circles indicate detected galaxies, triangles upper limits. 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 blue filled dots indicate the mean values and the standard deviations for the whole sample with Hi − def ≤ 0.4. The black solid line indicates the linear fit determined using all gas-rich galaxies (Hi − def ≤ 0.4). Mean values and best fits have been done including non-detected CO galaxies at their upper limit.
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