Energy injection time, t_b, normalized to the deceleration time of an equivalent impulsive Blandford–McKee blast wave, t_d,BM, as a function of the radio peak time, t_r, normalized to the peak time of the corresponding impulsive solution, t_r,BM for the one-dimensional simulations shown in Figures 3 and 4. Although the energy injection terminates before the Blandford–McKee deceleration time for all models (t_b < t_d,BM), the radio emission peaks substantially later than in the impulsive case.