{HEAD ~ Each device} 32 is held on {TAIL ~ the fixture} by a vacuum in the headspace above the device 32 
{ HEAD ~ Each device } 32 is held on { TAIL ~ the fixture } by a vacuum in the headspace above the device 32
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH