<div>Here's some links:</div>
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<div><a href="http://www.mindspring.com/~clist/PotGraph.html">http://www.mindspring.com/~clist/PotGraph.html</a></div>
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<div><a href="http://www.elby-designs.com/data-section.htm">http://www.elby-designs.com/data-section.htm</a></div>
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<div>hope that helps</div>
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<div>peng</div>