Comparison of multiple beam observations along the major axis corrected for aperture effects using the prescription based on a 3D-distribution of the molecular gas and assuming only the central beam (Eq. (11); left panels) and that of Saintoinge et al. (2011) (Eq. (13); right panels) on logarithmic (upper panels) and linear (in the range 100–5000 Jy km s^-1 sampled by the HRS galaxies) scales (lower panels) for galaxies with integrated data from Kuno et al. (2007). Different symbols are used for galaxies observed in the FCRAO survey of Young et al. (1995; cyan), Stark et al. (1986; magenta) and other references (black). Filled dots are for galaxies with D₂₅/θ ≤ 5, empty symbols for those objects with D₂₅/θ > 5. The short dashed black line shows the 1:1 relationships.