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Poor relations (like me) with Excel 2003 will have to change the spreadsheet, replacing the XL2010 function POISSON.DIST() with POISSON() in both the sheet and the VBA.See http://www.excelfunctions.net/Excel-Poisson-Dist-Function.html
A version converted by Chris for Excel 2003 is now available at http://dl.dropbox.com/u/45028756/FunnelPlot2003.xls .