Top row panels: comparison of the input structural parameters of the mock galaxies to the values measured by our photometric pipeline. The shown parameters are apparent magnitude (m_r′), effective radius in arcsec (R_e), position angle (θ), axis ratio (b/a), and Sérsic index (n), and the blue diagonal lines represent the 1:1 ratio. Second and third row panels: mean differences between the input and output parameters (input – output) as a function of their input and output mean effective r′-band surface brightness, , respectively. Bottom row: standard deviations of the input – output parameter differences as a function of the input mean . The dotted lines in the bottom row panels show the fits to the standard deviations as defined in Eq. (10).