{HEAD ~ The method} 6 wherein {TAIL ~ the predetermined characteristic} is a predetermined range of power levels for the fiber optic signal 
wherein
{ HEAD ~ The method } 6 wherein { TAIL ~ the predetermined characteristic } is a predetermined range of power levels for the fiber optic signal
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH