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cm_rap=.5d0*dlog((p0+p3)/(p0-p3))
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elseif (abs(lpp(2)) .ge. 1) then
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call sample_get_x(sjac,x(ndim),ndim,mincfig,0d0,1d0)
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c Set CM rapidity for use in the rap() function
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p0=ebeam(1)+xbk(2)*ebeam(2)
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p3=sqrt(ebeam(1)**2-m1**2)-xbk(2)*ebeam(2)
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cm_rap=.5d0*dlog((p0+p3)/(p0-p3))
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c Set CM rapidity for use in the rap() function