Difference in reduced χ² between i_M light curve fits by a constant and by an SN-like shape (see text), as a function of the latter χ². All cuts of the SN selection previous to that illustrated in this figure have been applied. Black dots stand for SNLS data (top) and synthetic SN Ia events (bottom). In both plots, green squares (resp. red triangles) are data events identified by spectroscopy as Type Ia (resp. core-collapse) SNe. Events above the curve are selected by the analysis.