Emission of the Cep E-mm outflow as observed in the CO 2–1 line with the PdBI at 1″ resolution by Lefloch et al. (2015). Four main velocity components are detected: a) the outflow cavity walls (black) emitting at low velocities, in the range [−8;−3] km s⁻¹ and [−19;−14] km s⁻¹ in the northern and southern lobe, respectively; b) the jet, emitting at high velocities in the range [−135;−110] km s⁻¹ in the southern lobe (blue) and in the range [+40;+80] km s⁻¹ in the northern lobe (red); c) the southern terminal bow shock HH377, integrated in the range [−77,−64] km s⁻¹ (green); and d) the northern terminal bullet NB integrated in the velocity range [+84,+97] km s⁻¹ (magenta). First contour and contour interval are 20% and 10% of the peak intensity in each component, respectively. The synthesized beam (1.″07 × 0.″87, HPBW) is shown in the bottom left corner. The dashed black box encloses the central protostellar region studied with the SO N_J = 5₄–4₃ line (see Fig. 2). The main axes of the northern and southern lobes of the jet are shown with black arrows.