The default GX_Simulator rendering routines use a set of 10 built-in nonthermal electron distributions over energy (see Fleishman, G. D. & Kuznetsov, A. A. 2010, 'Fast Gyrosynchrotron Codes', 721, 1127-1141 and its on-line supplements ), which may be selected by assigning a value between 1 and 11 to the DIST_E parameter listed in the editable Parameter Table . Substitution of any non-integer value between 1 and 11 will result in the use of downward rounded integer number. Substitution of any number outside the 1 to 11 range will result in the use of a default value '1'.

The following electron energy distributions are implemented:

1. Free-free only(FFO)
   
2. Thermal(THM)
   
3. Single power law over kinetic energy(PWL)
   
4. Double power law over kinetic energy(DPL) 
   
5. Thermal/nonthermal over kinetic energy(TNT)
   
6. Kappa(KAP) 
   
7. Power law over absolute value of momentum(PLP) 
   
8. Power law over Lorentz factor 
   
9. Therrmal/nonthermal over the absolute value of momentum(TNP) 
   
10. Thermal/nonthermal over Loretz factor(TNG)