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Hi:

I have been digging into the problem and i have realized the problem for the
plot function is double.

if i call

insert-> image->plot-> curve, then gnuplot is invoked (ususccesfullly)

but if i call

insert-> image->plot-> surface, then texgraph is invoked (again
ususccesfullly) could it be a different problem?

I have installed texgraph from courcelle as indicated in the texmacs.org

cheers