Question: what is the height of the st. louis arch in feet and yards
[{'answer': '630 - foot'}, {'provenance': [{'wikipedia_id': '53353', 'title': 'Gateway Arch', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 612, 'bleu_score': 0.7704068430393091, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16281069596427468474}, 'section': 'Section::::Abstract.'}]}]