Top panel: transmission spectrum of GJ 1214b. Overplotted are the atmospheric models for GJ 1214, using the same linestyles as in Fig. 6 for the atmospheric models. Our data are plotted as filled circles, the VLT data from Bean et al. (2010) as crosses, the Spitzer data from Désert et al. (2011a) as stars, and the data from Croll et al. (2011) as diamonds. Middle panel: the same data points as in the top-panel but now with different models overplotted showing the change in radius ratio due to different amounts for the base levels of stellar spots in the GROND i-band. The dotted, dashed, dash-dotted and the dashed-triple dotted lines are for 10%, 5%, 2.5% and 1% contribution from stellar spots in the i-band. Bottom panel: the observed transmission spectrum, but now corrected for a spot-dimming in i-band due to spots of 5% (The dashed curve in the middle panel), which corresponds to a spot coverage of 10% of the stellar surface. The i-band radius ratio was kept at the same level as in the other panels.
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