Transmission CCF for WASP-49b. This shows the spurious residuals that the Rossiter-McLaughlin effect could imprint on the transmission spectrum at the location of a typical stellar absorption line. The two transmission CCFs shown are computed from the observed data (dashed line) and simulated using the master CCFs (full line). The vertical dashed lines show the limits of the normalization regions (outer two lines at v ≃ ± 10.1 km s^-1), FWHM of the (middle two lines at v = ± 3.37 km s^-1), CCF centroid (central line at v = 0 km s^-1). The systemic velocity was subtracted. The two outer continuous vertical lines represent the maximum planetary radial velocity during the transit (v ≃ ∓ 16.3 km s^-1at the first and fourth contact).