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

File: <base>/training/ningbo/g14/JS23661.hea (772 bytes) 
JS23661 12 500 5000
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JS23661.mat 16x1+24 1000.0(0)/mV 16 0 49 9906 0 aVF
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JS23661.mat 16x1+24 1000.0(0)/mV 16 0 -29 12299 0 V2
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# Age: 88
# Sex: Male
# Dx: 445118002,427084000,365413008,13640000,427172004
# Rx: Unknown
# Hx: Unknown
# Sx: Unknown