def METHOD_NAME(self, list_of_parameters):
    """define self.dep_mass and self.dep_width in case that they are 
    requested in the param_card.dat"""
    from particles import all_particles
    self.dep_mass = [(part, part.mass) for part in all_particles \
                        if part.pdg_code > 0 and \
                                        part.mass not in list_of_parameters]
    self.dep_width = [(part, part.width) for part in all_particles\
                         if part.pdg_code > 0 and \
                            part.width not in list_of_parameters]        