2 CONTOUR
  Syntax:   CONTOUR i1 i2 [devs] [ngrid]
      or    CONTOUR i1 i2 xlo xhi ylo yhi
  Defaults: devs=2.5, ngrid=25

  In the CERN version of MINUIT only the first syntax is available.
  The `ngrid' parameter is not in the C. Rippich version of MINUIT.
  Use the `MNCONTOUR' command to get a graphical contour.

  Makes a 2-D plot of FCN in the 2 variables, ranging in:
    VAR1 = CURRENT-VAR1 +- DEVS*CURRENT-ERROR
    VAR2 = CURRENT-VAR2 +- DEVS*CURRENT-ERROR

  (or uses explicit range `xlo...xhi', `ylo...yhi' if given).
  Plotted are characters `1, 2, ... A, ... Z, *, ...'
  That means that `1' stands for `AMIN+1*UP', `2' for `AMIN+4*UP',
  `3' for `AMIN+9*UP', etc.

