Hi,
I've not looked in detail, but for your calculation, it looks to me that
you don't need an integral quantity.
Just use a postprocessing :
{ Name Tave; Value { Integral { [ what you want ] ; In Sfc ;
Integration I ; Jacobian J ; }}}
and then in PostOperation :
Print[ Tave [Sfc], OnGlobal , File "surf.result", Format Table];
(tell me if I'm wrong)
Regards,
O.C.