H₂CO 3_0,3−2_0,2,CH₃OH 4_2,0−3_1,0 and HNCO 10_0,10−9_0,9 transitions detected with both IRAM 30 m and NOEMA towards Cep E-mm. Left: 30 m spectra (black) and NOEMA spectra convolved to the single-dish beam (red). Both spectra are displayed with the same spectral resolution. The black dashed line marks the cloud velocity ν_lsr = −10.9kms⁻¹. Right: emission map obtained with NOEMA. The interferometric synthesised beam is represented by the grey disc. White star marks the observing position of the 30 m and the beam width at half-power is drawn by a black dashed circle. The locations of protostars Cep E-A and Cep E-B are marked by stars.