Optical spectral sequence of AT 2022fnm. The spectra have been calibrated against the photometry. The offsets applied to each spectrum are shown in the plot, and the +90 d spectrum has been multiplied by a factor of 2 for clarity. Negative fluxes have been set to zero. The +2 d spectrum is plotted in grey with a version binned to 10 Å overplotted in black to compensate for the noise of the spectrum. The absorption features seen at approximately 6725 Å and 8200 Å are artefacts.