Impact of a varying accelerated electron fraction ζ: spectral evolution – pulse width and time lags. Curves are plotted for Case B with a varying parameter ζ during internal shocks (see text), either with the same ejection duration as in the reference Case B (black) or with an extended high-Lorentz factor tail in the ejecta (red): see Sect. 5.1. For the first case (black, 2 s duration for the ejection), the corresponding spectra and light curves are plotted in Fig. 8 and in the right panel of Fig. 10. Left panel: the time evolution of the peak energy and the low-energy photon index. The dashed vertical line indicates the start of the high-latitude emission. Right panel: evolution of the pulse width and time lags, as in Fig. 3.
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