PGPLOT Module: PGQWIN -- inquire window boundary coordinates

SUBROUTINE PGQWIN (X1, X2, Y1, Y2)
REAL X1, X2, Y1, Y2

Inquiry routine to determine the current window setting.
The values returned are world coordinates.

Arguments
X1 (output) : the x-coordinate of the bottom left corner
of the window.
X2 (output) : the x-coordinate of the top right corner
of the window.
Y1 (output) : the y-coordinate of the bottom left corner
of the window.
Y2 (output) : the y-coordinate of the top right corner
of the window.