Relative photocenter shifts derived from the amber differential phases across Brγ. After excluding the outliers at extreme offsets and points corresponding to the continuum (−50 < NE < 50) the linear regression fit (blue line) to the photocenters across the line (plotted in blue) yields the disk position angle (48.5    ±    1.5)°. The NE shifted points correspond to the shorter-wavelength wing of the Brγ emission profile, the SW shifted points to its longer-wavelength wing.