{HEAD ~ The present invention} relates to {TAIL ~ the field} of variable emittance devices, and more particularly to passively variable emittance devices 
relates to
{ HEAD ~ The present invention } relates to { TAIL ~ the field } of variable emittance devices , and more particularly to passively variable emittance devices
HEAD HEAD 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