Transmission light curve of HD 189733b in the planetary rest frame from the three transits, centered on the sodium D2 and D1 lines (averaged), with bandpasses of 0.75 Å. Vertical dashed lines represent the beginning, middle, and end of the transit based on ephemerides. Left panel: before the corrections for stellar effects, which are overimposed. Right panel: after the correction for CLV- and RM-related effects.