{HEAD ~ The substrates} have {TAIL ~ a coefficient} of thermal expansion that is greater than that of the dielectric layers, and the thicknesses of the substrates are selected to provide compensation for temperature dependant variations in the center wavelength of the filter 
have
{ HEAD ~ The substrates } have { TAIL ~ a coefficient } of thermal expansion that is greater than that of the dielectric layers , and the thicknesses of the substrates are selected to provide compensation for temperature dependant variations in the center wavelength of the filter
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH