σ_NMAD curves used to select the most likely galaxy cluster candidate members for the Low-z-CHANCES target catalogues for each set of photometric redshifts: T80S/S-PLUS (green), LS-DR9 (light-blue), LS-DR10 (blue) and LS-DR10-CBPF (yellow). The curves were obtained through a polynomial fit on the σ_NMAD histogram with equally log(m_r) sized bins for each of the z_phot training sample (see Section 3 for details), dashed lines indicate the m_r-limit at which a constant value was adopted for selecting the cluster galaxy candidate members. These curves evidence the differences in m_r distributions of the different training samples used to determine z_phot.