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