def METHOD_NAME(self):
    if self.x_average is True:
        c_plated_Li_av = pybamm.Variable(
            "X-averaged lithium plating concentration [mol.m-3]",
            domain="current collector",
            scale=self.param.c_Li_typ,
        )
        c_plated_Li = pybamm.PrimaryBroadcast(c_plated_Li_av, "negative electrode")
        c_dead_Li_av = pybamm.Variable(
            "X-averaged dead lithium concentration [mol.m-3]",
            domain="current collector",
        )
        c_dead_Li = pybamm.PrimaryBroadcast(c_dead_Li_av, "negative electrode")
    else:
        c_plated_Li = pybamm.Variable(
            "Lithium plating concentration [mol.m-3]",
            domain="negative electrode",
            auxiliary_domains={"secondary": "current collector"},
            scale=self.param.c_Li_typ,
        )
        c_dead_Li = pybamm.Variable(
            "Dead lithium concentration [mol.m-3]",
            domain="negative electrode",
            auxiliary_domains={"secondary": "current collector"},
        )
    variables = self._get_standard_concentration_variables(c_plated_Li, c_dead_Li)
    return variables