Fig. 2
The comparison between values of the (B − V) colour as computed from a 5 kpc aperture (x axis) and the fiber aperture (y axis) magnitudes. The solid line represents the 1:1 relation that highlights a systematic, off-set of ~0.1 mag: the 5 kpc colour is bluer as expected since the total magnitude is sampling, on average, younger populations in the outskirts of the galaxies.
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