Question: what types of data are best measured by a cartogram map
[{'answer': 'travel time', 'provenance': [{'wikipedia_id': '938069', 'title': 'Cartogram', 'start_paragraph_id': 1, 'start_character': 71, 'end_paragraph_id': 1, 'end_character': 82, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'population', 'provenance': [{'wikipedia_id': '938069', 'title': 'Cartogram', 'start_paragraph_id': 1, 'start_character': 84, 'end_paragraph_id': 1, 'end_character': 94, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'GNP', 'provenance': [{'wikipedia_id': '938069', 'title': 'Cartogram', 'start_paragraph_id': 1, 'start_character': 99, 'end_paragraph_id': 1, 'end_character': 102, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '938069', 'title': 'Cartogram', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 352, 'bleu_score': 0.9657992495762461, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13707580436196358290}, 'section': 'Section::::Abstract.'}]}]