Single 2D Gaussian fitting of visibility versus spatial frequency, for the continuum, Brγ line and Pfund lines, respectively. Each point was fitted individually, and a size was estimated from the HWHM, Table 5. Above, left panel: continuum visibilities corrected for the stellar contribution. The errors are too small to be seen in the plot; middle panel: Brγ pure line visibilities; right panel: averaged Pfund visibilities.