Scheme of the geometry of the AD-corona model proposed to provide a qualitative explanation for the observed $\mathrm{\Gamma }-v_{\mathrm{C}\mathrm{I}\mathrm{V}}$ relation. Panel (a): AD-corona system in which the inner part of the AD is puffed up and the X-ray corona is cold, producing steep X-ray spectrum. In this configuration, faster AD winds can be launched from more internal AD regions. Panel (b): standard AD and a hotter X-ray corona producing a canonical X-ray spectrum where only low-velocity winds can be launched from outer regions of the disc.