Schematic view of the regions of dominance for various mechanisms of photon escape on the magnetic field – temperature plane, I – diffusion escape, II – relativistic jumps, III – natural line broadening, IV – recoil. The region where cyclotron driven wind is possible is above the dashed lines. The left figure is for a white dwarf (M_WD = 1   M_⊙), and the right figure is for a neutron star (M_NS = 1.4   M_⊙, R = 12 km).