Class map for JKB 18. The orange, red, and violet rings near the centre of the image are due to the residual of a bright foreground star that was removed by discarding spectra with a redshift of zero. In all the class maps in this paper, the order of the class numbers is chosen to follow the similarity of the mean spectra of the classes as determined by the Euclidean distance, and white pixels are discarded spaxels for which ALFA returned a discrepant or unreliable redshift.