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

File: <base>/training/ningbo/g4/JS14557.hea (771 bytes) 
JS14557 12 500 5000
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JS14557.mat 16x1+24 1000.0(0)/mV 16 0 -298 6800 0 V2
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JS14557.mat 16x1+24 1000.0(0)/mV 16 0 54 6881 0 V6
# Age: 50
# Sex: Male
# Dx: 164890007,425856008,55827005,427172004
# Rx: Unknown
# Hx: Unknown
# Sx: Unknown