You can use
\setupGNUPLOTterminal [context] [dashed=no, textscale=0.9]
Thank you, Mojca! The dashed option is ok, but I didn't manage to have 'textscale' work: adding these lines in my previous example still gives 12pt font... Am I missing something?
* ' and " quotes do not give the same result when UTF-8 character are involved. Is it wanted?
No. It's the same problem that I have mentioned last time. If you take a look at filename-gnuplot-1.plt you will see:
set ylabel "h\dochar {233}llo" set xlabel 'h\dochar {233}llo'
The second case gets literally to the output file, but then ConTeXt interprets it OK again. In the first case backslash is lost, and you get nonsense. This can be solved by using \detokenize as descriibed last time, but then again - it would be best if Taco or Hans or someone else had an idea of how to prevent that weird expansion inside \startGNUPLOTscript. I always use simple quotes for no particular reason (or maybe because I sometimes want to use \bf or other commands with backslash).
Sorry to make you explain again, I'm a bit lost with all those new things... I'll use simple quotes from now on, but is there a simple way to escape the ' character in this case? I tried set xlabel 'I\'\ m sorry!' but the ' is not typeset correctly then. A big thanks for your great patience! Morgan