Sets up explicit indices for the local geometry, for testing purposes
        :param explicit_indices: explicit indices for the neighbors (set of numbers
        from 0 to CN-1 in a given order)

def setup_explicit_indices_local_geometry(self, explicit_indices):
        """
        Sets up explicit indices for the local geometry, for testing purposes
        :param explicit_indices: explicit indices for the neighbors (set of numbers
        from 0 to CN-1 in a given order)
        """
        self.icentral_site = 0
        self.indices = [ii + 1 for ii in explicit_indices]