{HEAD ~ A gas spring fluid} is located in the large cannister, which has a vapor pressure sufficient to force the volatile fluid into the small cannister in the absence of sunlight on {TAIL ~ the east cannister} 
{ HEAD ~ A gas spring fluid } is located in the large cannister , which has a vapor pressure sufficient to force the volatile fluid into the small cannister in the absence of sunlight on { TAIL ~ the east cannister }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL