I do remember that in old version of excel it was possible to perform
copy/paste special for charts inside excel and select object or photo in
paste special dialogue box. In this case by changing the data the graph
didnt change. Now I am using Excel 2003 and after copying the chart, paste
special is still grey. I presume that Excel 2003 doesnt support this option
any more.

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Rasoul Khoshravan Azar
Kobe University, Kobe, Japan