Recovered transmission spectrum of GJ 1214 b. The solid red line shows the solution to the combined transit light curve, with ﹩1\sigma ﹩ confidence intervals (for the regularized spectrum) shown in dashed red. Dotted lines indicate the recovered transmission spectrum from each individual transit, and the average of these is shown as a solid blue line. No significant spectral features are detected except an overall decrease of planetary radius with longer wavelengths.