Models of a small section of the optical spectrum showing the variations in the spectral lines with υ_eq sin i for a fixed inclination (upper panel), and with the inclination, i, for a fixed value of υ_eq sin i. The parameters of the models are given in Table 2. We note that the profile of the Ca I 445.48 nm line, which appears in Figs. 4 and 5, and that of the Fe II 445.16 nm, which also appears in Fig. 5, are scaled in those figures to an intensity at the bottom of ~0.9 for plotting purposes. In this figure, all three lines show their actual relative intensities.