Surface brightness profiles of galaxies with Type II disc-break, with (g − i) colour as third parameter. In each plot, the break radius (B_r) is marked at the intersecting point of the linear fits performed between h_in and h_out, with σ_nBr as the median of (n + 1)³ combinations of best fits on the inner and outer scale-lengths. The vertical dashed lines (max_hin and max_hout) indicate the regions for max_rangein = range_in ± n and max_rangeout = range_out ± n where the algorithm produces (n + 1)² linear least square fits. The shaded regions on h_in and h_out indicate the median of the rms of the residuals for (n + 1)² linear least square fits.