Transmission spectra of the Hα (right) and Hβ (left) lines presented by Yan & Henning (2018, green), Cauley et al. (2019, black), Turner et al. (2020, blue), and Wyttenbach et al. (2020, orange). Wavelengths are in vacuum to match those of the synthetic transmission spectrum. The data have been rebinned by a factor of six for visualisation purposes, and have been aligned to the same wavelength employing Gaussian fits (see Fossati et al. 2020). The red solid and dashed lines show the synthetic NLTE and LTE transmissionspectra, respectively. The vertical black dashed lines enclose the wavelength ranges considered to compute the χ² and values. The horizontal dotted line at 1.0 sets the continuum level to guide the eye.