Light curves in the spherical (full lines) and hybrid (planar geometry and spherical assumptions for peak frequency and luminosity, dash-dotted lines) cases at fixed frequency $\tilde{\nu }=0.1$. Top panel: light curves with the Band's spectral shape. Bottom panel: broken power-law spectral shape. The total light curve in the hybrid + Band case is redrawn in the bottom panel (dotted line) for the sake of comparison. The individual contributions from each shock change but the resulting light curve do not, apart from the slightly increased breaks from the increase in crossing times. The choice of spectral shape decreases total emission at this frequency, while keeping the same time evolution.