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

File: <base>/training/ningbo/g14/JS23991.hea (768 bytes) 
JS23991 12 500 5000
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JS23991.mat 16x1+24 1000.0(0)/mV 16 0 -63 -29799 0 aVF
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JS23991.mat 16x1+24 1000.0(0)/mV 16 0 10 -28543 0 V2
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JS23991.mat 16x1+24 1000.0(0)/mV 16 0 15 575 0 V4
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# Age: 57
# Sex: Female
# Dx: 47665007,427084000,251223006,59931005
# Rx: Unknown
# Hx: Unknown
# Sx: Unknown