provide more informative error message in Thellier GUI if site latitude/longitude are missing
provide more informative error message in Thellier GUI if site latitude/longitude are missing
lfairchild/PmagPy,Caoimhinmg/PmagPy,lfairchild/PmagPy,Caoimhinmg/PmagPy,lfairchild/PmagPy,Caoimhinmg/PmagPy