measuring {HEAD ~ characteristics} of {TAIL ~ a subset} of said plurality of processing regions, defining measured characteristics 
of
measuring { HEAD ~ characteristics } of { TAIL ~ a subset } of said plurality of processing regions , defining measured characteristics
OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH