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