Velocity dispersions (σ) of the N₂D⁺(2–1), N₂H⁺(1–0), DCO⁺(2–1), and H¹³CO⁺(1–0) lines across the cores. Blue contours show the integrated intensities of the corresponding species. The first contour is at the 5σ level and thecontour step is 5σ. Stars show the positions of YSOs from Rebull et al. (2010): black stars indicate young, flat, and Class I objects, white stars indicate more evolved, Class II and III objects.