def copy_tier(self, eaf_obj, tier_name):
if tier_name in eaf_obj.get_tier_names():<EOL><INDENT>eaf_obj.remove_tier(tier_name)<EOL><DEDENT>eaf_obj.add_tier(tier_name,<EOL>tier_dict=self.get_parameters_for_tier(tier_name))<EOL>for ann in self.get_annotation_data_for_tier(tier_name):<EOL><INDENT>eaf_obj.insert_annotation(tier_name, ann[<NUM_LIT:0>], ann[<NUM_LIT:1>], ann[<NUM_LIT:2>])<EOL><DEDENT>
Copies a tier to another :class:`pympi.Elan.Eaf` object.

        :param pympi.Elan.Eaf eaf_obj: Target Eaf object.
        :param str tier_name: Name of the tier.
        :raises KeyError: If the tier doesn't exist.