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External module function Scalc - used by mcdiff and mcphas

In order to calculate the total spin $\langle \hat\mathbf S\rangle$ the following function has to be present in the module file *.so: 

extern "C" void Scalc(Vector & S,double * T, Vector & Hxc, Vector & Hext,
                      double * gJ, Vector & MODPAR,
                      char ** sipffilename, ComplexMatrix & Icalc_parstorage);

it works exactly as mcalc, therefore we do not give more details here.