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You could also use the R interface in Sage to produce things, using their standard fitting and error bar tools.

Edit: R is probably the industry standard for statistical/modeling/fitting stuff. Of the statistical variety. http://www.r-project.org is the site. You can do

sage: r?

for basic info, and see the whole documentation at this page for more info (apparently it's not in the reference manual yet. I also have a sample at sagenb, but that site is so overloaded that it might be hard to access...