A pair of spaced apart radio frequency shielding continuous screens span {HEAD ~ each window opening} and are supported by {TAIL ~ the window unit frame} 
A pair of spaced apart radio frequency shielding continuous screens span { HEAD ~ each window opening } and are supported by { TAIL ~ the window unit frame }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL