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

File: <base>/training/ningbo/g29/JS39142.hea (704 bytes) 
JS39142 12 500 5000
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JS39142.mat 16x1+24 1000.0(0)/mV 16 0 -88 1975 0 aVL
JS39142.mat 16x1+24 1000.0(0)/mV 16 0 425 24615 0 aVF
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# Age: 4
# Sex: Male
# Dx: 426783006
# Rx: Unknown
# Hx: Unknown
# Sx: Unknown