Hi,
In one of the threads " Excel 2007 : Spline or Interpolate function for 2007" I saw, interpolation functions can be used in excel.

Interpolation functions like spine() and others can be used using "XlXtrFun.xll" (link from old thread "http://www.ozgrid.com/Excel/excel-in...-curve-fit.htm")

But the read me file(ReadMeXlXtrFunAndSurfGen.htm) says it can be used till Excel 2000. I want to use interpolation functions in excel 2010. Kindly guide me on how to use it in excel 2010.