Dear Otfried,
In the preamble I have added:
\usepackage[miktex,siunitx]{gnuplottex}
\usepackage{siunitx}
and in the paragraph mode:
\begin{gnuplot}[terminal=cairolatex]
plot sin(x)/x
\end{gnuplot}
but it does not work, probably because pdflatex
needs -shell-escape option in the command line.
How to do it in IPE?
Thanks in advance
Jerzy