Fig. 3

Line profile residuals (observed–inverted). As in Fig. 2, the residual profiles are labeled with their respective phases. The phase-combined rms residual is 4.2 × 10−4 but systematic deviations appear in individual profiles at ± 3 × 10−3. We note that the S/N of the line-averaged data is between 3500 and 10 000 and is thus in the same range as the residuals.
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