{HEAD ~ The method} 60, wherein {TAIL ~ the region} is identified with sufficient precision to distinguish the region from 1.5×1014 other regions 
wherein
{ HEAD ~ The method } 60 , wherein { TAIL ~ the region } is identified with sufficient precision to distinguish the region from 1.5×1014 other regions
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH