["region:us"]
[{"name": "time", "dtype": "timestamp[us]"}, {"name": "label", "dtype": "string"}, {"name": "position", "dtype": "int64"}, {"name": "is_beat", "dtype": "bool"}, {"name": "signal", "dtype": {"array2_d": {"shape": [1200, 3], "dtype": "int16"}}}, {"name": "exam_uid", "dtype": "string"}, {"name": "to_review", "dtype": "bool"}]