@staticmethod
def script_default():
    """ Return a default script
        """
    s = """
        #-----------------------------------------------------------
        # syntax for parameters definition:
        # name: value, low_bound,  high_bound
        #  * for fixed parameters
        #  $ for variable parameters
        #  > for reference to a parameter in the COMMON block
        #    (> is forbidden in the COMMON block)
        # common block parameters should not have a _ in their names
        #-----------------------------------------------------------
        #
        
        COMMON:
        # common parameters ex.
        experiment_variables: ampl
        
        # $ gwidth: 1.0, 0.0, none
          $ gratio: 0.5, 0.0, 1.0
        
        MODEL: LINE_1
        shape: voigtmodel
            $ ampl:  1.0, 0.0, none
            $ pos:   0.0, -100.0, 100.0
            > ratio: gratio
            $ width: 1.0, 0, 100
        
        """
