load("docdraw.mac");

docdraw3d("figures/draw_explicit3",
	key = "Gauss",
	color = "#a02c00",
	explicit(20*exp(-x^2-y^2)-10,x,-3,3,y,-3,3),
	yv_grid = 10,
	color = blue,
	key = "Plane",
	explicit(x+y,x,-5,5,y,-5,5),
	surface_hide = true)$