Red sequence fit from the CMD for Abell 85. The left panel shows the CMD, the grey points correspond to the galaxy cluster candidate members selected by our photometric method, the open coloured symbols show the colour-range bins used to fit the red sequence, yellow stars correspond to the mean m_g − m_r colour in each bin obtained from a gaussian fit, while the best fit is shown with a black solid line including the ±1σ region in red and delimeted by dotted lines. The dashed line indicates the bright-faint boundary at m_r = 18.5. The right panel shows the m_g − m_r bins distributions, overlaid in black lines show the best guassian fit for each distribution while the dashed lines indicated the mean average m_g − m_r colour.