First row: observed relative flux of the Na i D lines. This is the final observed transmission light curve from our data reduction. The data are from the HARPS observations of HD 189733b. The data points are the average of D1 and D2 lines and are binned every 0.02 phase step. The black line is the modelled transmission light curve which is the combination of the CLV effect and the best-fit Na i absorption. Second row: CLV light curve. The black line is the modelled CLV effect and the red line is the observed light curve which is obtained by removing the Na i absorption model from the observed transmission light curve. Third row: Na i absorption light curve. The red line is the observed light curve with the modelled CLV effect removed and the black line is the best-fit Na i absorption light curve. Fourth row: residuals between the observed data (the top row) and the model. The three columns correspond to the observed flux measured using the band widths of 0.75Å, 1.5Å and 3.0Å, respectively. The errorbars represent the photon noise within the passband.
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