Difference between the peak velocity measured in this work (V_p) for the NLVC and that measured by Banzatti et al. (2019; V_p[B19]), plotted against V_p. The V_p of Banzatti et al. (2019) have been corrected by the slightly different adopted RV with respect to our work. The two dashed lines at ± 1.5 km s⁻¹ indicate the velocity uncertainty of our measurements. Symbols colours refer to the disk type (red: full disks, blue: disk with sub-structures, green: TD) while squares indicate sources with a HVC.