The limit is 255 or 256 series, I forget which. But it's well beyond 12.

What is the data like? Could you use XY series instead of lines? Even if you
define different X values for the different series, all are plotted using
the X values of the first series.

- Jon
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Jon Peltier, Microsoft Excel MVP
Tutorials and Custom Solutions
http://PeltierTech.com
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"quantity limitation for line chart?" <quantity limitation for line
wrote in message
...
In a line chart, when the quantity of the line groups is over 12, the
line
and its data will not coherent with each other? what is the problem?