Transmission spectrum of GJ1214b reconstructed by merging results from the present work (magenta circles) with all the published data that assumed the same prior as we did on i and a/R_⋆ (see the legend on the right). Theoretical models with different compositions calculated for GJ1214b by Howe & Burrows (2012) are plotted with solid lines. Upper panel: low μ, cloud-free atmosphere with solar composition (red line). Middle panel: high μ, cloud-free atmosphere composed by pure water (blue line). Lower panel: featureless (constant) spectrum simulating a high-altitude layer of opaque clouds (green line). The corresponding χ² values are reported for each case.