Will Two Do? Varying Dimensions in Electrocardiography: The PhysioNet/Computing in Cardiology Challenge 2021 1.0.3

File: <base>/training/ningbo/g3/JS12997.hea (766 bytes) 
JS12997 12 500 5000
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JS12997.mat 16x1+24 1000.0(0)/mV 16 0 83 3742 0 V6
# Age: 88
# Sex: Male
# Dx: 713427006,164934002,29320008,195042002
# Rx: Unknown
# Hx: Unknown
# Sx: Unknown