2 Datacards
  Syntax: number name value error lolim hilim
   where: number  is any number, but in the end, no holes may exist
                  in the list of parameter names/numbers. If there is one,
                  you will be asked to fill it in.
          name    any name you like (10 characters will be kept).
          value   is the starting value for the parameter
          error   is the starting uncertainty in the parameter which
                  will be updated during the fit
          lolim   is the lower limit on the parameter
          hilim   is the upper limit on the parameter

  If `lolim',`hilim' are given, make sure that value +/- error lies well within
  `lolim...hilim', or else MINUIT gets very angry!
  If you give `lolim=hilim=0.0', the parameter is unbounded.
  Otherwise the parameter is restricted to range from `lolim' to `hilim'.
  It is recommended that the expected final fitted parameter should lie
  close to the midpoint of the limit interval, otherwise MINUIT performs poorly.

  At least, number name value must be supplied.
  `error, lolim, hilim' will be set to zero if not supplied.

  A card saying 'END' ends the dialog, and fitting can start.

  Datacards are written for you in Mn_Fit, so you do not have to worry about
  them.

