Syntax: xplot (FITS file)  [row= (specify for 2-D spectra)]
           [ef=(error FITS file)]  [cf=(continuum FITS file)]
           [ (2nd FITS file)  [ (3rd file) ] ... up to 4 ]
           [ xs= ] [ xe= ] [ min= ] [ max= ]  [ mfm= ]
           [ nh= ] [ nv= ] [ npg= ] [ bin= ] [ -norm ]
           [-quit] [-oo] [-hist] [-dots] [-dash] [ color= ]
           [ y=plot#,ymin,ymax [ y= ... ] ]  [pglw=]
           [ -ps | ps=file | device= ] [-portrait] [-colorps]
           [ uf=(user command file) ]
           [ uf0=(user command file for initial commands) ]
           [ ewf=(output filename for equivalent width data)]
           [ ll=(line list file)]  [ qaf=(qso abs. line file) ]
           [ aux=(qal,hlm,...) {Auxilary mode key commands} ]
           [ xgf= ]  [sl=(systems list file)]
  Options:
    nh,nv,npg : # horizontal plots, # vertical, # of pages.
    mfm=      : set minimum as a fraction of maximum value.
    -oo       : show object only on title line.
    pglw=     : Set PGPLOT line width (1 to 201).
    -portrait : Use protrait (not landscape) for PostScript.
    -colorps  : Make color PostScript file (note that you
                will always get color PostScript if the
                environment variable PGPLOT_PS_COLOR is set.)
    xgf=      : XgapFraction (default=0.02)