okay. Yes. Thanks you another times.
In this case it is good.
What’s the result ?
My preference would be to :
- darken a little the gridlines (
--MAP_GRID_PEN_PRIMARY=thin,gray,dashed) - compress the y-axis so the gridlines would look more squared (
-JXsize_x/size_y) - increase the size of the dots (
-Scsize)

(and of course, title, legend … )
thank you very much for your support.
I will try this solution of yours to see if I like it too.
