Parameters

 Keyword  Posn  Type        Description
 -------  ----  ----        -----------
 
 MODEL      1   UNIV        Data object containing model
                            specification.
        GLOBAL.FIT_MODEL (Default fit model)
 MODEL_SPEC 2   CHAR        Model specification, eg. AB*(BR+LG)
 PAR        3   INTEGER     Component number
 PARS       4   INTEGER[]   Component numbers, separated by
                            commas or spaces
 VALUES     5   CHAR        1,2 or 3 real numbers separated by
                            commas or spaces
 OPTION     6   CHAR        Command option character
 GEN        -   CHAR        Genus of model
    Hidden default = SPEC
 SCREEN     -   LOGICAL     Start up in screen mode?