Print with gnuplot

[pironman]

Hi to everyone.
I'm trying to print a graph with some greek letters. To do that, I activate
the "graphics_toolkit gnuplot".
In that graph there is a grid, with the octave anteprime I see this grid
dashed, but the printed pdf is a continue line. Can I make it dashed, and
thinner?
Another question: this happen with windows 7. I try the same code in another
pc, with Debian Stretch, and in this case I have the line in the graph
purple, also if i set "color","black", why?

Thank you



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