Response below/inline for email Michael Heerdegen wrote:
> (original email sent 29 Nov 2024 at 00:17)
> 
> I'm not a sophisticated org user.  May I ask for a simple example,
> and how I would have to invoke gnuplot instead?

Sure, see attached.  This example has a table of data to plot (simple
example with two columns) and the gnuplot src block to create a PDF
plot.  You invoke gnuplot by typing C-c C-c in the src block.  You can
then view the result with C-c C-o.

Check the info manual for org, specifically
(org) Working with Source Code

HTH,
eric
-- 
: Eric S Fraga, with org 9.7.15-a1df10 in Emacs 31.0.50