Exponents for the different energy loss stages from left to right: compton (A, D), synchrotron (B, E) and adiabatic stage (C, F). The top panels (A–C) show the variation of the slopes using a fixed spectral slope of s = 2.5 and the bottom panels (D–F) present the changes in the slopes for a fixed helical magnetic field (b = 1.5). The different values for d are colour-coded and can be found in the plot legend.