Recovery of total magnitude as a function of B/T and input magnitude m_r,B+D,Sim. Top left: average offsets of magnitudes of single-Sérsic fits, m_r,B+D,Sim – m_r,SS,fit, in multi-band fits (ideal fits produce small symbols). Bottom left: standard deviation of the same value (small symbols represent good fits and small scatter). Right column: same plots, but from B/D fits, for the combined magnitude m_r,B+D,Sim = m_r,D,Sim + m_r,B,Sim. In general, the total magnitudes of the objects can be well recovered by both single-Sérsic and B/D fits; however, the scatter increases towards fainter objects and objects with higher B/T values, which are known to be harder to fit than disk-like systems. Only bins with more than 20 objects are shown, to ensure reasonable number statistics in each bin.