a package containing {HEAD ~ the array} of {TAIL ~ light emitting elements} and the substrate, the package enclosed with a window, wherein the window has two surfaces 
of
a package containing { HEAD ~ the array } of { TAIL ~ light emitting elements } and the substrate , the package enclosed with a window , wherein the window has two surfaces
OTH OTH OTH 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