Baseline measured with all stations on before we close magnet:

S1:
	s1-base-26-jan.gif

S2:
	s2-base-26-jan.gif
	s2-base-26-jan-y20.gif
S3:
	s3-base-26-jan.gif
	s3-base-26-jan-y20.gif

Isolating s3-o8 chassis-1 from magnet improved S-2 noise overall.
One layer of Al foil(~1mil) might not be thick enough to shield radiated 
noise. Need to revisit it after we close up magnet. Maybe need to add 2nd 
layer after we reopen lamshade in IR.