Fig. 1
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Rossiter-Mclaughlin effect of WASP-77 Ab observed with HARPS. The observed data points (black) are shown with their error bars, which in this case are smaller than the symbol size. The systemic velocity was removed for better visibility. The red line shows the model that fits the data best, together with 1σ (dark gray) and 3σ (light gray) confidence intervals.
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