Comparison between the shapes of surface brightness profile and abundance gradient in galactic discs. The grey points show the observed surface brightnesses (abundances). The dashed (red) line is the purely exponential (linear) fit to those data, the solid (black) line is the broken exponential (linear) fit. NGC 3815 and UGC 3969 are examples of galaxies where the surface brightness profile is well fitted by a purely exponential disc and the abundance gradient is well described by a purely linear relation. UGC 841 and UGC 7145 are examples of galaxies where the surface brightness profile is well fitted by a purely exponential disc but the abundance gradient shows a prominent break. NGC 6155 and PGC 64373 are examples of galaxies where the surface brightness profile shows an appreciable break while the abundance gradient is well described by a purely linear relation. IC 1151, UGC 5, and NGC 2730 are examples of galaxies where both the surface brightness profile and the abundance gradient display a prominent break.
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