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