Low resolution spectrum of the nucleus of 2P/Encke. The spectrum is normalised to unity at 638 nm. On the original spectrum (black line), the binned one (red line) is superimposed. The gaps around 600 nm and 750 nm are areas that have been masked due to artefacts created by issues in the solar analogue star spectrum at those wavelengths. The same normalisation, binning and masking also applies to all other spectra shown in this paper (Figs. 5, 7, 8).