Slices through the centre of the domain, comparing the morphologies of the protostellar system in runID (columns 1 and 3) and runAO (columns 2 and 4) on three different spatial scales at the epoch of second core formation. Panels a–h: display a wide region around the first Larson core, the typical scale of a protoplanetary disk. Panels i–p: immediate vicinity of the first Larson core. Panels q–x: present the second Larson core and its close surroundings. Two left columns: side x–z views of the system, while the two right columns display the top x–y perspective. The coloured maps in each row alternate between representing the gas density and temperature. The arrows on the density maps depict the gas velocity field. Overlayed onto the temperature maps are magnetic field lines (left column) and AMR level contours (right column).