ECG = 'ECG'
PPG = 'PPG'
RR_INTERVAL = 'RRI'
NN_INTERVAL = 'NNI'
TAGS = 'TAG'
OTHER = 'OTH'

CHOICES = [
    (ECG, 'ECG'),
    (PPG, 'PPG'),
    (RR_INTERVAL, 'RR Interval'),
    (NN_INTERVAL, 'NN Interval'),
    (TAGS, 'Tags'),
    (OTHER, 'Other signal')
]
