Radial evolution of the best-fitting τ illustrating the nature of the SFHs of the individual zones (early collapse vs. continuous mass assembly) for UGC 12250. A linear fit was performed, which slope depicts how steeply the observed SFHs evolve, from the centre to the periphery of the galaxy. A grey vertical line indicates the isophotal radius of the bulge, comprising 3 isan. Over the figure it is provided the value of the estimated slope.