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Fig. 2.
Relation of Petrosian half-light and 90% light radii with the scalelength of a spiral galaxy, either with a purely exponential disk or with some bulge component with 20% of the light; we set hz, * = 0.3 kpc, hz, d = 0.1 kpc, and Md = 2.8 × 107 M⊙.
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