Left panels: cumulative distribution function (CDF) of the CO line luminosity derived using the spectra convolved to the same linear scale of 0.24 pc. The median values per class are shown as vertical dashed lines in their corresponding colours. Right panels: line luminosity of the same CO lines versus the bolometric luminosity of the TOP100 clumps in distance-limited sub-sample. The median values for each class are shown as open diamonds and their errorbars correspond to the absolute deviation of the data from their median value. Points having an upward arrow indicate a self-absorption feature in the spectrum and correspond to a lower limit. The typical error bars are shown in the bottom right side of the plots. The black solid line is the best fit, the light grey shaded area indicates the 68% uncertainty, and the dashed lines show the intrinsic scatter (ϵ) of the relation.