Source: record afdb/04015 
 Start: [09:00:00.000]
val has 2 rows (signals) and 900000 columns (samples/signal)

Duration:  1:00:00

Sampling frequency: 250 Hz  Sampling interval: 0.004 sec

Row	Signal	Gain	Base	Units
1	
ECG1	200	0	mV
2	
ECG2	200	0	mV


To convert from raw units to the physical units shown
above, subtract 'base' and divide by 'gain'.
