> In any case, can you please post a patch against the standard
> version?  Or, maybe easier, simply post ob-maxima.el as the other
> changes are not necessary for me to test your patch.

I though my previous patch was applied. It is still under review due to
copyright papers.  I am attaching a patch against master branch and
ob-maxima.el file.

The commit message is
ob-maxima.el: add input variables, png graphic
output, table as an output