Distributions of spectroscopic redshifts for galaxies within ﹩35^{\prime} ﹩ from the cluster centers. The blue histograms represent galaxies from SDSS and the orange histograms represent galaxies from MMT. The bin size is 0.002. In each panel, the green dotted lines indicate the cluster redshift range z _c ± σ _zc from the RXGCC catalog. The inset shows the zoomed-in distribution of both SDSS and MMT galaxies around the cluster redshift. The dotted area labels out the member galaxies.