Fig. 11
Examples of the observed surface brightness profiles and fits. In each panel, the grey points show the observed surface brightness profile. The dashed (red) line indicates the pure exponential fit to those data. The solid (black) line indicates the broken exponential fit. The upper panel shows the galaxy NGC 1324 with an observed surface brightness profile close to a purely exponential disc. The middle panels shows the galaxy NGC 2347, which exhibits humps and troughs in the observed surface brightness profile. The lower panel shows the galaxy NGC 2730 with a surface brightness profile with a clear break.
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