Now I know that it's supposedly possible to colour one's curves: such documentation as I've been able to dig up makes reference to the "spadcolors palette": there's even a domain PAL (Palette), but I can't find how to actually specify a colour; whether RGB (and in which case as a list of three integers each between 0 and 255, or hexadecimal, or by name, or some other method).
Or can this whole business now be done neatly with gnuDraw? I note that gnuDraw, while no doubt excellent, has no examples in its documentation, so I've no idea how to actually use it.
Note: I've checked out color.spad, palette.spad, and view2D.spad, but without a couple of examples I'm somewhat at sea.