The top and middle panels show spectra of the two brightest galaxies in the cluster (solid line). Wavelength regions associated with bright sky emission lines have been excised from the spectra – which have subsequently been resampled to match the spectrograph resolution. Total exposure time for each spectrum is 2 h. The smooth line in each panel shows a low-redshift elliptical galaxy template (Kinney et al. 1996) that has been redshifted and scaled to match the data on wavelength scales >500 Å. The vertical dotted line in the middle panel indicates the observed frame location of [O ii]λ3727 emission. The lower panel displays the sky spectrum which is shown as a dotted line in wavelength regions excised from the spectra plotted above. The spectra are corrected for relative flux calibration, although this correction is uncertain longward of 9000 Å.