SET

        [GREG1\]SET Argument [Value [...]] [/DEFAULT]

    Specify or reset some default value for a parameter used by GreG.  These
    values  may  sometimes  be  overridden  for  a  single  command  by  the
    appropriate   option   (e.g.   /BLANKING   and   SET   BLANKING).    SET
    Argument/DEFAULT reset the default values for the given key.

    SET/DEFAULT reset all default values of SET including the FONT  and  the
    PLOT_PAGE  ;  thus  the  plot  cleared.  Use PENCIL/DEFAULT to reset the
    PENCIL definitions, and  TICKSPACE  0  0  0  0  to  reset  tick  spacing
    parameters.