Comparison of observed composite spectra of HD 93028 at opposite phases of maximum separation (in black) with synthetic templates shifted in RVs around the He Iλ5876 spectral line. The individual synthetic spectra for each component are overplotted with dashed blue and green lines, representing the primary and the secondary, respectively. The solid red line corresponds to the combined synthetic spectrum (see Sect. 3.3 for information on the generation of synthetic spectra).