Synthetic map of Model Ml at t = 1500 yr considering a projection angle with respect to the plane of the sky of 47°, as observed in Cep E-mm. CO J = 2-1 integrated emissivity contour maps of the cavity (Black contours, 3–7 km s⁻¹) and the jet (Blue contours, 50–150 km s⁻¹) components. Scaling is logarithmic. The response of the IRAM interferometer was modeled by a Gaussian of 830 au diameter (FWHM), corresponding to a beam size of 1″ (FWHP) at the distance of Cep E-mm, which is drawn with a gray disk (bottom left). The location of the frontal shock is marked with a red point.