Comparison of an early spectrum and late spectrum of AT 2022fnm with other objects. The spectra have been normalised against the sum of the flux densities except in the case of the insets, which have been normalised against the peak of Hα. The phases are calculated relative to the epoch of the onset of the outburst. The upper-left inset shows Hα. The +83 d AT 2018hso spectrum has been trimmed to 4500–9000 Å and binned to 10 Å, owing to noise.