Synthesised spectra as compared with those of SN 2018fip. Solid black lines represent the reference model spectra. The dashed black lines (on days 18 and 23) show the synthesised spectra with the high-velocity component included in the spectral synthesis calculations, demonstrating that this component is not present at late epochs. The observed spectra are shown with grey lines. The same constant in flux has been added for the model and data as an offset for presentation purposes (3.6, 2.0, 0.8, and 0.0 for day 6, 9, 18 and 23, respectively).