Moment-one map of the ¹⁸CO J = 2−1 transition (>2σ) around M512 (left). The black contours are the B6 continuum [3, 10, 100]σ levels. The green line is the TIPSY model trajectory for M = 0.15 M_⊙ and v_sys = 3.25 km s⁻¹. The position-velocity diagram of the streamer emission (grey contours) is extracted along the TIPSY trajectory and includes the inner protostellar region (right). The TIPSY fit to the radial velocities is reported as a green line.