I'd like to plot something as green-solid, green-doted, red-solid,
With the X11 driver I can choose the linestyle as 1, 2, ... to change
With 'set term post' I can use it to choose solid, dotted, etc.
Using 'set term post color', I can choose between nine different lines, like
red-solid, green-dashed, blue-small-dashed, pink-dotted,
After the tenth style, the same pattern repeats.
Question: How can one separately choose colour and linepattern?