Calibrated V-band (circles) and B-band (triangles) differential light curves of SN 2014J, compared with Star 1, as a function of the time in days measured since t_max(B) = 2 456 690.5 (JD; Foley et al. 2014). Each panel corresponds to one night of observations. The B-band curves are offset by 0.95 mag in the upper panels and 1.05 mag in the lower panels for clarity. The black lines represent least-square fits to the photometry.