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====== pole_zero ====== The double precision parameter pole_zero defines the smallness of the denominator in the relativistic h-term for the consideration of A as an actual resonance of the relativistic integration. An appropriate value is about 1.d-10. If |A + om*gamma*ms/kpar + nn*qs/kpar| is less than pole_zero, A is not considered a pole since it cancels with the denominator of the h-term. ---- pole_zero has to be defined as a global variable for all relativistic runs. pole_zero is part of the namelist &system.