Comparison between the synthetic PoWR model (solid red line) used for cross-correlation and the normalised spectrum of al taken in March 2020 (noisy blue line). The line profiles of the PoWR model were shifted by 330 km s⁻¹, and the EWs of the N IV λ4058 and Ν Vλ4945 proflies were scaled to the observations for the sake of plotting (the EW has no impact on the cross-correlation algorithm). The spectra of a2, a3, and с are comparable, and so is the match between the model and the data.