Evolution of the source-intrinsic parameters taking radiative and adiabatic losses into account (red points) and only adiabatic losses (black points). The different panels show the variation in the total particle density, N_tot (panel i), the relativistic energy density, U_re (panel ii), the magnetization σ = U_B/U_re (panel iii) and the electron Lorentz factor (panel iv). The circle and diamond markers in panel iv) correspond to the upper and lower electron Lorentz factors. For more details see text.