Gnuplot - rectangles as objects outside graph area?

Question

I would like get something like this:

Rectangle outside graph:

Could I get that with set object <number> rect ? Or is this only to draw rectangles inside graph?

Answer 1

you can use the screen coordinates (which refer to the entire window) like so:

set object 1 rect from screen 0.0, screen 0.9 to screen 0.1, screen 1.0

this would create a rectangle in the top left 10% of the plotting window