[DATA FITTING]


[Name]

      Give a name to the binary system (will be stored in an
      output configuration file, if you choose to write one.

[Mass and Separation]

      For the calculation of a <radial velocity curve>,
      the orbital period, binary mass and the 
      separation of the stars must be known in absolute 
      units (here: days, solar mass and solar radius).
      Only two of these three are required -- set the
      third one to 0.0 and use 'Compute' to obtain its 
      proper value.

[Fit]

      This will use the <Simplex> algorithm
      to determine the <best-fit binary geometry> for
      your observational data. <Note> that this has
      some shortcomings - not related to this special 
      algorithm - which are discussed in more detail
      in the manual.
      After completion, the binary geometry is 
      automatically <reset> to the best-fit values.
      For better results, <restart> then at least once.
      <All data> currently in memory will be fitted
      simultaneously.
      <All parameters> for which the <fit> option is
      toggled will be fitted. All else will remain constant.

[Simulated Annealing]

      This will use the <Simulated Annealing> algorithm
      to determine the <best-fit binary geometry> for
      your observational data. <Very time-consuming>.

[Map]

      This will create a two-dimensional map of the
      <merit function> (which is a measure of the
      goodness of a fit) with respect to two parameters.
      Start values are the current values, step values
      can be entered. The gridsize is fixed at compile time
      (default 16 x 16, i.e. 256 lightcurves will be evaluated).