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

File: <base>/training/ningbo/g23/JS33397.hea (748 bytes) 
JS33397 12 500 5000
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JS33397.mat 16x1+24 1000.0(0)/mV 16 0 -20 979 0 aVF
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JS33397.mat 16x1+24 1000.0(0)/mV 16 0 -29 11435 0 V2
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# Age: 64
# Sex: Female
# Dx: 426177001,164873001,55930002
# Rx: Unknown
# Hx: Unknown
# Sx: Unknown