Histograms of the velocity corrections applied to the spectra for sources in both star forming regions. Panels (a) and (b) show the radial velocity and the heliocentric velocity corrections. Panels (c) and (d) show the velocity corrections measured from the Paδ and Li lines. The red dashed line marks the median value of the Paδ and Li shifts, with the corresponding mean and standard deviation listed in each panel.