Phase plots of the $\delta S_{\nu }/\overline{S_{\nu }}+1$ distribution at t = 184.7 Myr for all our models at all frequencies versus the same distribution but at 150 MHz. The top, middle and bottom rows correspond to the fresh injection model, the re-acceleration model assuming a Dirac Delta pre-existing distribution function and the re-acceleration model assuming a power-law pre-existing distribution function, respectively. The differences between the columns correspond to the different parameters studied first (second) column correspond to ℳ_cr = 1 (ℳ_cr = 2.3), γ_cut = 10² (γ_cut = 10³) and s = 2.25 (s = 3) in the first, second and third rows, correspondingly.