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

File: <base>/training/ptb-xl/g4/HR03256.hea (747 bytes) 
HR03256 12 500 5000
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HR03256.mat 16x1+24 1000.0(0)/mv 16 0 -140 -13441 0 V6
# Age: 30
# Sex: Female
# Dx: 426783006
# Rx: Unknown
# Hx: Unknown
# Sx: Unknown