Fig. 1
Original images. Top-left panel: u − r colour versus the Sérsic index in r-band. Top-right panel: u − r colour versus 
. Bottom-left panel: versus 
. Bottom-right panel: versus . All the parameters have been derived with multi-band fitting with the use of galfitm. The dashed lines are in the following values: u − r = 2.3, nr = 2.5 and = 1.2. In the bottom-right panel we plot the 1:1 line.
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