Returns dict indicating if there are antibonding states below the Fermi level depending on the spin
            spin: Spin
            limit: -COHP smaller -limit will be considered.

def has_antibnd_states_below_efermi(self, spin=None, limit=0.01):
        """
        Returns dict indicating if there are antibonding states below the Fermi level depending on the spin
            spin: Spin
            limit: -COHP smaller -limit will be considered.

        """
        warnings.warn("This method has not been tested on many examples. Check the parameter limit, pls!")

        populations = self.cohp
        number_energies_below_efermi = len([x for x in self.energies if x <= self.efermi])

        if populations is None:
            return None
        elif spin is None:
            dict_to_return = {}
            for spin, cohpvalues in populations.items():
                if (max(cohpvalues[0:number_energies_below_efermi])) > limit:
                    dict_to_return[spin] = True
                else:
                    dict_to_return[spin] = False
        else:
            dict_to_return = {}
            if isinstance(spin, int):
                spin = Spin(spin)
            elif isinstance(spin, str):
                s = {"up": 1, "down": -1}[spin.lower()]
                spin = Spin(s)
            if (max(populations[spin][0:number_energies_below_efermi])) > limit:
                dict_to_return[spin] = True
            else:
                dict_to_return[spin] = False

        return dict_to_return