Measured flux as a function of aperture diameter D_ap, normalized to the flux measured at D_ap = 2″, for M_h ∼ 10¹¹ h⁻¹ M_⊙ (red) and M_h ∼ 10¹⁰ h⁻¹ M_⊙ (blue) galaxies, with the shaded regions giving the 68% PI. For the M_h ∼ 10¹¹ h⁻¹ M_⊙ galaxies, the observed flux for D_ap = 2″ is ∼50% compared to D_ap → ∞, but since a smaller D_ap means less noise, slightly better results are achieved for .