Impact of the initial distribution of the Lorentz factor in the outflow. Left and middle panels: normalized light curves corresponding to the 4 BATSE energy channels for Case B computed with the sharp initial distribution of the Lorentz factor given by Eq. (10) and a constant (left) or varying (middle) accelerated electron fraction (see text). Conventions are the same as in Fig. 1. Right panel: pulse width and pulse maximum position as a function of energy for the same cases (filled circles: constant ζ, open circles: varying ζ). The shaded regions and lines have the same meaning as in Fig. 3.
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