HWHM (left panel: [OI], right panel H₂) scaled by the square root of the stellar mass as a function of inclination. The coloured symbols show the models; the gd models (diamonds) are slightly shifted along the inclination axis for clarity. The black (grey) symbols show the observations, where the black coloured symbols mark the targets that show blueshifted peaks in the respective line profile. The solid lines show the maximum emission radius R_K derived for the given HWHM and inclination assuming Keplerian rotation for a thin disk (see Eq. (1)).