The regions in a contour chart are formatted by formatting the legend keys
(colored boxes) in the legend. Double click on a legend key, then activate
the Patterns tab, and choose None for area fill (and perhaps also for line
or border).

- Jon
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Jon Peltier, Microsoft Excel MVP
Tutorials and Custom Solutions
Peltier Technical Services, Inc. - http://PeltierTech.com
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wrote in message
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Is it possible to make a contour chart have a transparent series? I
understand that this is possible to do with bar graphs. Thanks.