Representative observed spectra for the FORS2 G600B, FORS2 G600RI, and WFC3 G141 grisms, the thicker coloured lines indicate spectra of WASP-6 whilst thinner grey lines correspond to that of the reference star, both target and reference spectra are normalized to the maximum of the target spectrum for that observation. Shaded bands indicate the selected wavelength binning for each grism.