Retrieved broadband transmission spectra of HD 189733b obtained from combining HARPS, CARMENES-VIS, and CARMENES-NIR (similar to the bottom panel of Fig. 3) shown as red hexagons. The solid blue line represents a forward model obtained from PLATON considering a Rayleigh slope. For comparison purposes, we also overplot the transmission spectra of HD 189733b obtained through multiband photometric transit observation obtained from HST and Spitzer as black triangles (Pont et al. 2013). The solid green line represents a forward model obtained from PLATON considering a super-Rayleigh slope.