2D Interpolation

I would like to perform interpolation 2D data sets and would appreciate advice in addins that will perform bicubic spline interpolation. Other interpolations, such as bilinear, would be helpful.

Here's a function for bilinear interpolation:

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I have some spline code -- I'll dust it off.

There's also an add-in (name escapes me at the moment) that does spline interpolation.

It's a UDF that has to be added to a workbook.

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Thanks.