Select the chart, then use the dropdown in the Chart toolbar to select a
series or trendline. Objects are hidden by formatting them (use Ctrl-1,
numeral one, to format a selected object) with no line, no marker, no
fill, etc. If the series is in-scale but hidden, you'll still see it
highlighted when it's selected.

- Jon
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Jon Peltier, Microsoft Excel MVP
Peltier Technical Services
Tutorials and Custom Solutions
http://PeltierTech.com/
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George wrote:
I don't think the data is off scale, but I must look into "hidden lines &
markers". How do I determine if hidden lines & markers exist? Thanks for
your response, it has given me a path to investigate.