pp1from33 = (a1f2*a2f1*a3fc3*ac3f3*u1b33)/
     ((1 - (1 - a1f2*a2f1 - a1f3*a3f1 - a2f3*a3f2)*(1 - e4))*
      (1 - (1 - a3fc3*ac3f3)*(1 - e5)))
 
pp1from33source = (a3fc3*ac3f3*pc3*u1b33)/(1 - (1 - a3fc3*ac3f3)*(1 - e5))
 
pc3 = (a1f2*a2f1)/(1 - (1 - a1f2*a2f1 - a1f3*a3f1 - a2f3*a3f2)*(1 - e4))