All three AMBER observations of HD 163296 with spectral resolution of 12 000. The three columns show the observed intereferometric results from 2012 May 11 (left), 2012 May 12 (middle), and 2012 June 04 (right). Shown from top to bottom are wavelength dependence of flux, visibilities, wavelength-differential phases (for better visibility, the differential phases of the first and last baselines are shifted by +50° and −50°, respectively), and closure phase observed at projected baselines as shown in the plot. The wavelength scale at the bottom is corrected to the local standard of rest. The typical visibilities, differential, and closure phases errors are ±5%, 5°, and 15°.