{HEAD ~ Methods} for manufacturing {TAIL ~ the filters} are described, including grinding and polishing procedures for obtaining the desired uniformity of thicknesses of said layers 
{ HEAD ~ Methods } for manufacturing { TAIL ~ the filters } are described , including grinding and polishing procedures for obtaining the desired uniformity of thicknesses of said layers
HEAD HEAD HEAD HEAD HEAD REL 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