If the temperature tuning coefficient is relatively large, {HEAD ~ the center wavelength} will vary substantially with {TAIL ~ temperature} 
vary substantially with
If the temperature tuning coefficient is relatively large , { HEAD ~ the center wavelength } will vary substantially with { TAIL ~ temperature }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL