In either arrangement, the reflective layer has {HEAD ~ an associated center wavelength}, which is substantially independent of {TAIL ~ temperature} 
is substantially independent of
In either arrangement , the reflective layer has { HEAD ~ an associated center wavelength } , which is substantially independent of { TAIL ~ temperature }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL