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

File: <base>/training/ningbo/g30/JS40490.hea (732 bytes) 
JS40490 12 500 5000
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JS40490.mat 16x1+24 1000.0(0)/mV 16 0 -83 22908 0 V6
# Age: 54
# Sex: Female
# Dx: 426783006
# Rx: Unknown
# Hx: Unknown
# Sx: Unknown