(Left) Map of the p-H₂O 3₁₃ − 2₂₀ emission between  − 110 and  + 70kms^-1 in the outflow of Cep E obtained with the IRAM 30 m telescope. Coordinates are in arcsec offsets with respect to the nominal position of the protostar. (Right) HO and SiO J = 8 → 7 emission detected towards the protostellar source. The HO emission is averaged over a region of 6″ × 6″ around the protostar. Intensities are expressed in units of antenna temperature. The different components of the spectrum are marked with arrows.