This zip file contains:

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(1) Cubic Spline for Excel v2.0:
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This is our latest version.  It requires Excel 2007 or later.  It is a compiled .net add-in (it is not VBA code).  It should be more convenient, more robust, and should run faster than our previous version.  It also includes a new linear interpolation function.  We recommend that you install this if you have Excel 2007 or later.

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(2) Cubic Spline for Excel v1.03:
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This is an earlier version of cubic spline.  It is written in VBA, and you can view the code.  It is compatible with any version of Microsoft Excel (Excel 95 or later).  We recommend that you use this only if you have Excel 2003 or earlier, or if you want to look at the VBA code for the function.  

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(3) Data Curve Fit Creator Add-in v2.50 Trial: 
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This is a fully functional 30 day trial edition of our Data Curve Fit Creator Add-in product, which does much more extensive curve fitting and data analysis in Excel.  

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To find out more about all our products, visit:
http://www.srs1software.com
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