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Listing 2. FORTRAN Code Fragment

      poiint = 0.0
      do it=1, ntetra
      i1 = itetra(1,it)
      i2 = itetra(2,it)
      i3 = itetra(3,it)
      i4 = itetra(4,it)
      cx = 0.25*(vertex(1,i1)+vertex(1,i2)+
     &     vertex(1,i3)+vertex(1,i4))
      cy = 0.25*(vertex(2,i1)+vertex(2,i2)+
     &     vertex(2,i3)+vertex(2,i4))
      cz = 0.25*(vertex(3,i1)+vertex(3,i2)+
     &     vertex(3,i3)+vertex(3,i4))
      ch = 0.25*tetvol(it)*(p(i1) + p(i2) +
     &     p(i3) + p(i4))
      poiint = poiint+ch/sqrt((cx-x(1))**2+
           (cy-x(2))**2+(cz-x(3))**2)
      enddo
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