In {TAIL ~ another embodiment}, {HEAD ~ the passive variable emittance device} is adapted to be used as a temperature controlled optical switch 
In
In { TAIL ~ another embodiment } , { HEAD ~ the passive variable emittance device } is adapted to be used as a temperature controlled optical switch
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH