In {TAIL ~ any event}, {HEAD ~ the temperature tuning coefficient} should be zero or approximately equal to zero to minimize any variation in the center wavelength due to temperature  
In
In { TAIL ~ any event } , { HEAD ~ the temperature tuning coefficient } should be zero or approximately equal to zero to minimize any variation in the center wavelength due to temperature
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH