Flux-calibrated blue spectra taken on 23 and 26 January 2004. Left: grayscale representation of the first night, with spectral flux increasing from white to black. Right: mean spectra of the Hγ to Hβ spectral region at spin maximum (black) and spin minimum (blue) for the orbital phases noted in the figure. The best-fit continua that represent the lower envelope to the spectra are shown as magenta curves. The spin modulation of the emission-line component is shown in red.