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c Start loop over propagators
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do i=-1,-(nexternal-3),-1
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if (iforest(1,i,iconfig) .eq. 1.or.iforest(1,i,iconfig) .eq. 2)then
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xm(i) = xm(iforest(1,i,iconfig))+xm(iforest(2,i,iconfig))
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xe(i) = xe(iforest(1,i,iconfig))+xe(iforest(2,i,iconfig))