Flux at 3 GHz as a function of age and ejecta size with D = 10 Mpc for an SNR (E₅₁ = 1, M_ej, ⊙ = 1, n₀ = 1), a KNR (E₅₁ = 1, M_ej, ⊙ = 0.1, n₀ = 0.1), and a EKNR (E₅₁ = 10, M_ej, ⊙ = 0.1, n₀ = 0.1). We have chosen ${\overline{ϵ}}_{e,-1}=1$ and ϵ_B, −2 = 1. We have included the corrections by Margalit & Piran (2020) in the left panel of the figure to highlight the qualitative features of propagation through jet-evacuated material. We ignore this aspect in the rest of the calculation and the remaining figures. The red and black curves overlap in the right panel, which is a coincidence because the difference in typical density compensates for that in ejecta mass.