2D integration using TF2

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Hello,

I have found a strange behavior of TF2 member function TF2::Integral():
when I tried to integrate a 2D function(which varied rather rapidly), it
only evaluated exactly 18 points and then gave a very rough result. I
tried to decrease the epsilon parameter, but still it evaluated only 18
points. There is no such a problem for 1D integration. Do you know what
is the reason of the problem and how can I get a much more accurate result
using the Integral() member function? Thanks!

Cheers,
Feng

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