2 MNCONTOUR
  Syntax:   MNCONTOUR par1 par2 [npnt]
  where:    par1  is the first MINUIT parameter number
            par2  is the second MINUIT parameter number
            npnt  is the number of points
  Defaults: npnt = 40

  Makes a  graphical contour  plot of 2  parameters. For  each point the
  function is  minimized with  respect to all the  other parameters. You
  can  set  the  contour  level  using  the   ERROR_DEF   command, which
  determines   the  change in  chi**2  or  likelihood  that the  contour
  represents. If the print level is >-1 the contour will also be printed
  on the terminal.

  Note that if you change the error  definition to get a 2 sigma contour
  for  example you  should  re-minimize  before  giving the  `MNCONTOUR'
  again. The contour is stored in a scatter plot 98765&999 which you can
  `COPY' or `RENAME'  before giving another  contour command if you want
  to keep it.

  This command is only available in the CERN version of MINUIT.

