This dataset contains 328, 30sec strips of ECG captured at 200 Hz. Each ECG file is saved in int16 binary format. Filenames ending in _grp[0-2] are reference labels, which are annotated by a group of cardiologists. In addition to reference files, each ECG strip also has 6 additional labels, with filenames ending in _rev[0-5] that correspond to 6 individual cardiologists annotating the data separately. Annotation files are saved in json format, with the list of rhythms saved under an "episodes" key.