The bolometric light curve of the optimal model (thick solid line) overplotted on the empirical bolometric light curve of SN 2000cb recovered from the BVI magnitudes reported by Kleiser et al. (2011) (open circles). Dashed line represents the model with the moderate ⁵⁶Ni mixing to 6800 km s^-1 compared to the one in the optimal model up to 8400 km s^-1 (Fig. 3). Dotted line shows the light curve of the model with the ⁵⁶Ni mixing to 3000 km s^-1 observed in SN 1987A. The light curve in the absence of radioactive ⁵⁶Ni is shown by a thin solid line.