{HEAD ~ An electric field} accelerates {TAIL ~ ions} and electrons in directions parallel to the electric field 
accelerates
{ HEAD ~ An electric field } accelerates { TAIL ~ ions } and electrons in directions parallel to the electric field
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH