How to Fill RooUnfold 2D response Matrix

Dear Rooters,

I have a simple question concerning RooUnfold.
How to initialize a 2D response matrix. There are Fill methods for 1D, 2D and 3D, however there is only constructor for 1D case.

https://gitlab.cern.ch/RooUnfold/RooUnfold/-/blob/2.0.1/src/RooUnfoldResponse.h

Many thanks in advance,
Waleed

The answer is to use the constructor
RooUnfoldResponse (const TH1* measured, const TH1* truth, const char* name= 0, const char* title= 0);

In that last case, measured and truth are used to specify the dimensions of the distributions

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