Source: record challenge/2010/set-c/c12
val has 8 rows (signals) and 75000 columns (samples/signal)
Duration:    10:00
Sampling frequency: 125 Hz  Sampling interval: 0.008 sec
Row	Signal	Gain	Base	Units
1	RESP	4093	2	pm
2	ICP	102.366666667	307	mmHg
3	PLETH	1023	0	NU
4	II	2046	1024	mV
5	V	2046	1024	mV
6	AVR	2048	1023	mV
7	ABP	17.0611111111	307	mmHg
8	CVP	102.366666667	307	mmHg

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