Transmission spectrum of WASP-69b. Top: data points and retrieved models. The blue green and red points are the transit depths obtained from the B, RI, and z grism observations, respectively. The grey line represents the median of all retrieval posterior sample spectra for the favoured power-law cloud model, with the shaded region indicating their 1σ interval. The blue line represents the cloud free model. Bottom: relative contributions of the different atoms and molecules to the retrieved spectrum.