Figure 1. Using PGPLOT
$ ./pgdemo
Graphics device/type (? to see list, default /NULL): ?
PGPLOT v5.0.0 Copyright 1994 California Institute of Technology
Legal PGPLOT device types are:
/NULL (Null device, no output)
/PS (PostScript file, landscape orientation)
/VPS (PostScript file, portrait orientation)
/CPS (Colour PostScript file, landscape orientation)
/VCPS (Colour PostScript file, portrait orientation)
/XWINDOW (X window window@node:display.screen/xw)
/XSERVE (A /XWINDOW window that persists for re-use)
Graphics device/type (? to see list, default /NULL): /XWINDOW
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