Top: schematic shift of the planetary sodium line inside the stellar sodium line during the transit. The size of the planetary line has been exaggerated. The gray area corresponds to 1 Å integration band. Bottom: effect of the planetary line shift on the excess light curve with the integration passband of 1 Å, causing a bump that reaches its maximum level around the mid-transit point. We note that the x-axis is also proportional to the transit time, with zero set on the mid-transit point.
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