Upper panel: the HH212 protostellar system as observed by ALMA−Band 7 (Codella et al. 2014). Blue/red contours plot the blue-/ redshifted SiO(8−7) jet at ±8 km s^-1 from V_sys, overlaid on the 0.9 mm continuum (black contours). Positions are with respect to the coordinates reported in Sect. 2. The filled ellipse shows the synthesised beam (HPBW) for SiO: (PA = 49°). Middle panel: zoom-in of the central region: the CH₃CHO(18_0,18−17_0,17)A emission integrated over ±5 km s^-1 (green contours and grey scale) overlaid on the SiO jet. First contours and steps are 5σ (50 mJy beam ^-1 km s^-1) and 2σ, respectively. The HPBW is (PA = 42°). Bottom panel: same as middle panel for HDO. The HPBW is (PA = 42°).