Final transmission spectrum of HD 189733 b centered around the sodium doublet in the planetary rest frame (light gray), also binned by 20× in black circles, without the correction of the CLV and RM effects (upper panel) and after their correction (middle panel). The blue line is the best-fit CLV+RM model used to correct the final transmission spectrum. The red line is the MCMC Gaussian fit applied to both lines of the sodium doublet. The blue dashed lines indicate the rest frame transition wavelengths of the sodium doublet. Lower panel: residuals of the Gaussian fit.