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

File: <base>/training/ningbo/g11/JS20724.hea (770 bytes) 
JS20724 12 500 5000
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JS20724.mat 16x1+24 1000.0(0)/mV 16 0 -15 -8930 0 V2
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JS20724.mat 16x1+24 1000.0(0)/mV 16 0 -112 -11083 0 V6
# Age: 84
# Sex: Male
# Dx: 284470004,427084000,251223006
# Rx: Unknown
# Hx: Unknown
# Sx: Unknown