Fit of η models to the transmission spectrum of WASP-49b. The spectra are binned by 15 ×. The vertical scale are relative radii and altitudes assuming a white light radius of 1.198 R_Jup (Table 1). One η model, set at the equilibrium temperature (~ 1400 K, in red), is adjusted to the continuum. Another model is adjusted to the line cores and is shown in blue. The latter model temperature is found to be K. The Gaussian fits are also shown in green for comparison.