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