This looks a bit similar,
made with pd.

H.

Hei,

depends on aspect ratio and camera position.
I use a [view 0 0 3( command to [gemwin] (moves the "camera")
to align a [rectangle 4 3] in a 4:3 window.
Then left and right are -4 and 4
and bottom and top -3 and 3.

Gr. H