Surface brightness profiles of the cold (panels a and c) and cold plus warm (panels b and d) orbital components for the galaxy sample normalised by each galaxy’s best-fit exponential disk’s scale length and central surface brightness. Shaded regions indicate 1σ uncertainties, derived from models whose χ² values lie within 1σ of the best-fit solution. Each line is coloured according to total galaxy mass (reddest curves indicate the most massive systems, bluest the least). Two rightmost panels (‘supra-exponential SBPs’): Galaxies whose cold profiles rise above the exponential in their innermost regions, revealing a ‘nuclear disk” within ∼0.5 R_D. Two leftmost panels (‘sub-exponential SBPs’): Galaxies whose cold profiles descend below the exponential (doughnut morphology) within the same region. The standard exponential profile is shown in black. Different colours represent the various galaxies of the sample.