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

File: <base>/training/ningbo/g3/JS12811.hea (748 bytes) 
JS12811 12 500 5000
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JS12811.mat 16x1+24 1000.0(0)/mV 16 0 -54 -539 0 V2
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JS12811.mat 16x1+24 1000.0(0)/mV 16 0 -59 573 0 V6
# Age: 83
# Sex: Female
# Dx: 698252002,164890007,55930002
# Rx: Unknown
# Hx: Unknown
# Sx: Unknown