The input and recovered SFH for a series of synthetic populations with two short (10 Myr) bursts of star formation. The oldest takes place at an age of 13.5 Gyr, with the second burst at an age of a) 10.5 Gyr, b) 9.5 Gyr and c) 8.5 Gyr. The solid black histogram shows the input population, given the SFH binning adopted. The solid red histogram shows the recovered SFH along with statistical errorbars. For comparison, the adopted SFH of annulus 1 of Sculptor (Fig. 13) is shown as the black dashed histogram.