Fig. 3
Left: Gaussian FWHM fit diameters of the Brγ line-emitting region for several individual spectral channels (in the center and the line wings) across the Brγ emission line (red bullets). The diameters are derived from continuum-compensated visibilities. Therefore, they are the diameters of the Brγ line-emitting region and not of the emission region of both line plus continuum. The AMBER spectrum of MWC 297 is shown for comparison (green curve). Right: Gaussian fit to the continuum-compensated AMBER visibilities at the peak intensity of the Brγ emission line.
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