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How can I break external links in PowerPoint 2007 but keep the charts editable (not images)?

I have created a few charts in an Excel file and then pasted them as links into PowerPoint (PPT). Whenever I update the excel file, PPT updates automatically. However when I break the links, the ...
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Programs for reading data off interactive web charts

This question is in the same vein as this one: Program for reading data off scanned graphs Recently more and more interactive charts show up on the Net. Have a look at the following one: ...