Table 1: Low energy limiting photon spectral index $\alpha $[i.e. $N(E) \propto E^\alpha $] for various emission models. For clarity the indices for the energy spectrum F(E) and for its E FE representation are also reported.
$\alpha $ $\alpha+1$ $\alpha+2$  
N(E) F(E) EFE model/spectrum
-3/2 -1/2 1/2 Synchrotron emission with cooling
-1 0 1 Quasi-saturated Comptonization
-2/3 1/3 4/3 Instantaneous synchrotron
0 1 2 Small pitch angle/jitter
      Inverse Compton by single e-
1 2 3 Black Body
2 3 4 Wien


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