Thanks again Uni for your profitable implementation of LM.
About "T" [ThermoCouple}: You will find that from nowhere except if NIST has
updated their stuff from original Mathcad [2003], as well as Kirby2.
Kirby2 & "T" demonstrate the most common Y/X data reduction.
Type "T" T/C covers nearly the all cryogenic range, very rugged vs Pt100.
As given, it fits NBS 125. You can personalize your own "T" by simulating
the fixed points from some good test bath ... won't be as accurate.

Jean

Genfit al_ nleqsolve.sm (243 KiB) downloaded 102 time(s).