Secondly, I don't know if you are aware of this or not, but should you interept the answer (even if its running on cluster), you ought to be able to get the NR residuals for the last three (I generally use 3 but you can enter all the more) iterations. https://reidbqcoz.ourabilitywiki.com/10265804/the_smart_trick_of_a_solution_that_no_one_is_discussing