Best fitting model (Ml) to the Cep E northern outflow, (top) Density distribution at 1250 yr. The jet has propagated over a distance of 2.4 × 10⁴ au and formed a low-velocity cavity of 3000 au radius. Five knots and their associated wings are detected along the jet.(bottom) Position-Velocity diagram of the CO emission along the jet main axis obtained using the 47° outflow inclination angle with respect to the plane of the sky.