Photometric target selection of Abell 500, using CBPF-z_phot, including the red sequence objects. The red-faint objects from S1506 completely fill the under-dense region in the faint-red-end and are homogenously distributed out to 5 × R₂₀₀. Similar as Figure 11 symbols represent the parent sample, spectroscopic objects and the photometric selected Abell 500 galaxy cluster candidate members in grey, yellow and blue respectively. We now include in magenta symbols the faint-red objects added through the faint-red sequence fit (see Section 3.2 for details). The upper panels show from left to right, the spectroscopic redshift distribution(z_spec), the z_phot − m_r diagram and relevant cluster information including the parent sample, total number of galaxy cluster selected objects, the confirmed spectroscopic cluster members (open circles), and the spectroscopically confirmed cluster members and spectroscopic objects within the cluster redshift range (yellow crosses) that were not selected by our method. The lower panels show from left to right the z_spec − z_phot diagram, along with the CMD and SSD. The red sequence-fit selected objects successfully fill in the faint-end, under-dense region and are homogenously distributed within 5 × R₂₀₀.