In {TAIL ~ some embodiments}, {HEAD ~ the electromagnetic radiation} can be rastered across one or more portions of surface 501 
In
In { TAIL ~ some embodiments } , { HEAD ~ the electromagnetic radiation } can be rastered across one or more portions of surface 501
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH