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