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

File: <base>/training/ningbo/g2/JS12315.hea (757 bytes) 
JS12315 12 500 5000
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JS12315.mat 16x1+24 1000.0(0)/mV 16 0 -68 10368 0 aVF
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JS12315.mat 16x1+24 1000.0(0)/mV 16 0 -39 16192 0 V2
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JS12315.mat 16x1+24 1000.0(0)/mV 16 0 -63 22267 0 V6
# Age: 86
# Sex: Female
# Dx: 426783006,270492004,55930002
# Rx: Unknown
# Hx: Unknown
# Sx: Unknown