If you mean the distance from the point to the end of the error bar, you
can assign values from the worksheet, using the Custom (plus) and Custom
(minus) entry boxes.
If you mean the size of the dash at the end of the error bar, Excel
picks it, and all you can do is show it or hide it (Format - Patterns).
- Jon
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Jon Peltier, Microsoft Excel MVP
Peltier Technical Services
Tutorials and Custom Solutions http://PeltierTech.com/
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All you can do to the error bar is make the line a little thicker. But
if you want columns, make a floating column chart. Check out this page
for some suggestions: