Intensities and the corresponding derived mass from the integrated CO(2–1) flux. This figure shows the total cumulative values contained in a given radius disk. The three symbols correspond to different H i windows used in the computation process. The conversion from CO luminosity to H₂ mass assumes a N(H₂) /I_CO(1−0) = 4 × 10²⁰ cm^-2/ (K km s^-1) and a line ratio of 0.8 (see Sect. 3.3). The error bars are based on the mean ΔI_CO over the disk as described in the last paragraph of Sect. 3.1.1.