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