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

File: <base>/training/ningbo/g35/JS45446.hea (752 bytes) 
JS45446 12 500 5000
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JS45446.mat 16x1+24 1000.0(0)/mV 16 0 -29 -2666 0 aVF
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JS45446.mat 16x1+24 1000.0(0)/mV 16 0 -29 814 0 V2
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JS45446.mat 16x1+24 1000.0(0)/mV 16 0 10 -11297 0 V6
# Age: 89
# Sex: Male
# Dx: 164873001,55930002,164896001
# Rx: Unknown
# Hx: Unknown
# Sx: Unknown