Plotting Options:
 < 1> xwin       X-Window (Xlib)
 < 2> tk         Tcl/TK Window
 < 3> xterm      Xterm Window
 < 4> tekt       Tektronix Terminal (4010)
 < 5> tek4107t   Tektronix Terminal (4105/4107)
 < 6> mskermit   MS-Kermit emulator
 < 7> versaterm  Versaterm vt100/tek emulator
 < 8> vlt        VLT vt100/tek emulator
 < 9> conex      Conex vt320/tek emulator
 <10> dg300      DG300 Terminal
 <11> plmeta     PLPLOT Native Meta-File
 <12> tekf       Tektronix File (4010)
 <13> tek4107f   Tektronix File (4105/4107)
 <14> ps         PostScript File (monochrome)
 <15> psc        PostScript File (color)
 <16> xfig       Xfig file
 <17> ljiip      LaserJet IIp/deskjet compressed graphics
 <18> ljii       LaserJet II Bitmap File (150 dpi)
 <19> hp7470     HP 7470 Plotter File (HPGL Cartridge, Small Plotter)
 <20> hp7580     HP 7580 Plotter File (Large Plotter)
 <21> lj_hpgl    HP Laserjet III, HPGL emulation mode
 <22> imp        Impress File
 <23> pbm        PDB (PPM) Driver
 <24> null       Null device
