Redshifts and equivalent line of sight velocities with respect to z = 0.1555. The data points indicated by blue circles with green error bars are averages from Hβ, [OIII] 5007, [NI] 5199, [OI] 6300. The blue line is the average from Hα and [NII] 6548. The grey band marks the 90% confidence range for the Chandra redshift fit. The narrow red band marks the cross correlation centre for the stellar absorption spectra. Angular distances in arcseconds are relative to the centre of the BCG, taken along position angle of 110°, running west to east (i.e. more positive with increasing RA).