Left panel: sketch of the morphology of the circumstellar medium of HD 101584 (not drawn to scale). The full extent and the identified morphological components: central compact source (CCS), equatorial density enhancement (EDE), hourglass structure (HGS) which forms the inner part of two diametrically orientated bubbles, and bipolar, high-velocity outflow (HVO) with extreme-velocity spots (EVSs), as well as a blow-up of the central region highlighting the CCS, EDE, and inner part of the HGS, are indicated. An hourglass structure suggesting a tentative second bipolar outflow, with a velocity gradient opposite to that of the HVO, is also shown. Right panel: CO(2–1) PV-diagram along PA = 90° at resolutions of 0.′′085 and 1.5 km s⁻¹ with the different components indicated. The flux scale is in mJy beam⁻¹.