CMD for all sources (black dots) in the M 105 Suprime Cam field. Obects that lay below the grey horizontal line at m_n − m_b = −1 are emission-line objects with an equivalent width EW_obs ≥ 110 Å. The magnitude range that is fainter than the limiting magnitude is denoted by the shaded grey region. The dashed (solid) red lines denote the 99.9% (99.9%) limits of the simulated foreground population. Black crosses denote the PNe candidates that were automatically selected, and blue dots denote those that were confirmed by visual inspection.