Galaxy distributions for C1 (left panel) and C2 (right panel) in the RGB image (combination of the i, r, and g bands) from the SDSS DR12. We show the contours of the X-ray images from Figure 1. The gray and color-coded circles represent galaxies between green dashed lines in Figure 2. The brown and green circles label out the cluster member galaxies within R ₂₀₀, and they are from the SDSS and MMT, respectively. The magenta boxes outline the centers of two clusters. The large dark blue circles indicate the cluster regions.