Modeled absorption of HD 189733b compared to observations from 2011 (Lecavelier des Etangs et al. 2012). The blue line shows the observed out-of-transit Lyα line profile of HD 189733. The green line shows the modeled in-transit absorption. The orange line shows the in-transit absorption observed in September 2011. The shaded region surrounding the orange line shows the observational errors. Our modeled spectrum reproduces the observed profile well (also in its red part) and is mostly within the error boundaries. Mean wind conditions were adopted, but the other cases produce identical results. The region between − 40 and + 40 km s⁻¹ was affectedby geocoronal emission in 2011 and should be ignored (Bourrier & Lecavelier des Etangs 2013).