Best-fit centroids to the differential phases of (a) observed data of IRAS 09149−6206, (b) best-fit Keplerian model described in Sect. 4.2, and (c) best-fit outflow model described in Sect. 4.3. The colour code represents the wavelength of the channels around the centre of the Brγ line. The coloured ellipses around each centroid in panel a represents the 68% (1σ) credible intervals of the uncertainty. The red plus sign at the origin represents the photocentre of the continuum. The black arrows in panels b and c indicate the origin of the BLR according to the inferred offset of the models.