Retrieved transmission spectrum of HAT-P-41b observed with GTC OSIRIS. The error bars are the averaged OSIRIS transmission spectrum. The orange lines are the median and 2σ credible intervals of the posterior models. The black dots are the posterior model after wavelength binning to the observational passbands. The shaded regions below the posterior model indicate the reference models with only TiO (red), MgH (blue), or CrH (purple).