Normalised spectra of β Lyr A for two out-of-eclipse phases (0.288 and 0.785). Observed data with uncertainties are indicated (blue), as well as synthetic data (yellow), residua (red), and large χ² contributions (red circles). This 1st model was only fitted to these two spectra. The Hα emission profile and its EW are well described, but there are systematic differences for the He I 6678 line; the synthetic Si II 6347, 6371 and Ne I 6402 lines have low EW.