Thank you Jim for this tip, it is very nifty. I'll be adapting it to some other cases.For the moment, I tried the exact same example test: the loop performs fine, but I cannot get to the last bit; as a matter of fact, none of the 7 tests on their own terminates ok, hence I'm not getting the proper logs written. This is due to a repeated "Tmix did not converge" type of error. (I'm encountering this error even after having updated my zm_conv.F90 file with Sean's latest version.) Do you have any idea where that could come from?Cheers,Thibaut.