Distribution on the sky of the cluster member candidates (red dots) and field galaxies (blue dots) within 500 kpc (~1.3 arcmin) from the X-ray position (marked by a black cross) of the example cluster, 2XMMi J143742.9+340810. Note the different scale in Fig. 4. The cluster galaxies with available z_s are marked by stars. The BCG candidate is marked by a black plus that has a projected separation from the X-ray position of ~11 kpc. We only present galaxies with m_r ≤ 22.2 mag, △ m_r < 0.5 mag, and △ z_p / z_p < 0.5.