High vacuum, which indicates minimal gas consumption, increases the size while {HEAD ~ low vacuum}, which indicates increased gas consumption, decreases {TAIL ~ the size} 
decreases
High vacuum , which indicates minimal gas consumption , increases the size while { HEAD ~ low vacuum } , which indicates increased gas consumption , decreases { TAIL ~ the size }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL