Vertical velocity and mass flux of hot H₂ along the redshifted lobe of DG Tau B. (a) V_z as a function of deprojected distance Z from the source, derived from H₂ 1−0 S(1) SINFONI/VLT observations. For comparison, the shaded red area shows the range of V_z across the CO redshifted conical flow, from outer to inner streamlines DV20. (b) Mass flux of hot H₂ as a function of Z (see text).