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Function Fitting To 3D Data


hi all - this may be a trivial question so apols if is 

i have some 3D data z =f(x,y) where x, y, and z for the know points are;

data = {{3,2,13.9},{3,5,13.4},{3,10,12.3},{12,1,15.6},{24,2,16.0},{60,5,14.1},{120,10,13.0},{240,20,11.7}}

and would like to find a function to fit all data to these limits {1,1,z},{1,20,z},{240,1,z},{240,20,z}

and the constraint is that is must pass exatly thou the know points - is this possible at all ? thanks , glenn 



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