Concurrently {HEAD ~ a stable positioning} of {TAIL ~ the measurement device} onto a placement area is achieved 
of
Concurrently { HEAD ~ a stable positioning } of { TAIL ~ the measurement device } onto a placement area is achieved
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH