Usually there exists a default file name or device name. The part after the slash gives the plotter type. Examples of the type are:
xs X-windows output. This window is resizeable and persistent. Prepending a number allows you to use multiple windows, e.g. 1/xs, 2/xs etc. xd X-windows output. A transient window that disappears when your task exists. ps Postscript (landscape mode). vps Postscript (portrait mode). cps Color postscript (landscape mode). gif gif files. Only supported with g77, not gfortran. vcps Color postscript (portrait mode). tek Tektronix 4010 or equivalent. xterm Xterm window (better for simple plots over slow X links).
A `?' as device name generates a complete list of the recognized types (which will most likely vary from system to system).
Files created for hardcopy devices must be spooled to the printer separately. The command needed for this is site and device specific.