Fig. 1
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Comparison of surface density profiles (left) and the cumulative distributions (right) for Sérsic (solid lines) and Spergel (dashed lines) functions. The light profile with a Sérsic index of 0.5, 1, 2, 4, and 5 and a Spergel index of 0.85, 0.5, −0.3, −0.6, and −0.7 is shown in different colors. By definition, Re, contains half of the integrated galaxy light.
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