Morphological correlation between the continuum emission and the line emission (moment-0) for the indicated transition, as quantified by V_N parameter from the astroHOG method. Values of V_N ≈ 0 and V_N ≈ 1 correspond to no correlation and perfect correlation in the distribution of the two emissions, respectively. The upper panels correspond to the correlation on the intersection of the moment-0 line emission mask and the mask_ext.. The lower panels correspond to a mask selecting only the compact sources where the line is detected, starting from mask_com.. The dotted and dashed histograms represent how the distribution would change if all the values were replaced by V_N − error (the error on the value of V_N is derived using an MC method, see Sect. 4.3) and V_N+ error, respectively.