In certain embodiments, {TAIL ~ surface} 501 is exposed to overlapping fields of {HEAD ~ electromagnetic radiation} 
In certain embodiments , { TAIL ~ surface } 501 is exposed to overlapping fields of { HEAD ~ electromagnetic radiation }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD