Data from Fig. 1 of Blundell et al. (2008) for the wavelengths of the centroids of three Gaussians fitted to the Hα spectra. The blueshifted narrow Gaussian is denoted by +, the redshifted by  × , and the broad Gaussian (the Hα profile of the wind) by  ∗ . The centre of the wind profile wanders back and forth between the railroad tracks, which have been attributed to a circumbinary disk. Orbital phase 0 (primary eclipse) occurs at JD +255.