Strength of the secondary maximum in the J-band as a function of the decline rate Δm₁₅(B). The symbols are the same as in Fig. 8. The lower panel shows the difference in magnitudes between the secondary maximum and the primary maximum, while the upper panel displays the difference in magnitudes between the secondary maximum and the local minimum. In each panel, the same quantities predicted by Kasen (2006) models are plotted for comparison.