Contributions of the different sources of opacity to the transmission spectra of HD 209458b (left panel) and HD 189733b (right panel) smoothed to a resolving power R = 300. The H2-He continuum, whose contribution is similar in shape to the H2-H2 continuum but lower because of the lower abundance of He with respect to H2, is not shown. The spectra have been calculated using the temperature from GCM simulations and the chemical composition from the nominal pseudo two-dimensional chemical model averaged over the whole terminator. Each line represents the transmission spectrum that results from a model in which only the opacity provided by each source is taken into account.
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