Normalised spectra of an T_eff-sequence of sample stars around Hγ (left), Hα (middle) and Pa13 (right panel), from the hot (top) to the cool end of the parameter range investigated here (bottom). The major spectral features are identified, short vertical marks indicate Ti ii lines. The Hα region is contaminated by narrow telluric lines. Vertical shifts of the spectra by multiples of 0.5 have been applied for clarity.