{HEAD ~ An optical filter} including a plurality of dielectric layers is provided between {TAIL ~ first and second substrates} 
is provided between
{ HEAD ~ An optical filter } including a plurality of dielectric layers is provided between { TAIL ~ first and second substrates }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL