> Maybe use '$2\\pi$'? I don't have TeX here to see the result, but
> when I look at introduction.tex, I see that it has $2\pi$ in it. Your
> version just has $2pi$.
>
I can not try it. The main problem is that latex cannot compile
introduction.tex created by maxima. By looking into introduction.tex one
can see that maxima cuts about 5 last lines of original(created by
gnuplot) introduction.tex. It makes compilation by latex impossible.
> Here the maxima output is such that latex runs OK and the dvi output looks
> very similar to the gnuplot output.
> For reference here is my
> Maxima 5.25.1http://maxima.sourceforge.net
> using Lisp SBCL 1.0.51.0-a546163
> on Mac OS X.
>
My version is
Maxima 5.29.1 http://maxima.sourceforge.net
using Lisp SBCL 1.0.40.0.debian
May be this bug appeared only in new maxima version?