{TAIL ~ 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 {HEAD ~ the east cannister} 
{ TAIL ~ 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 { HEAD ~ the east cannister }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD