{HEAD ~ The present invention} provides {TAIL ~ a single telescope} with a pair of three mirror anastigmats which may be moved with respect to one another to provide a multiple field of view optical system 
provides
{ HEAD ~ The present invention } provides { TAIL ~ a single telescope } with a pair of three mirror anastigmats which may be moved with respect to one another to provide a multiple field of view optical system
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL 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