{HEAD ~ Ions} are trapped in {TAIL ~ a potential well} in the linear trap 30 and are bunched at the bottom of the potential well adjacent an exit segment 50 
are trapped in
{ HEAD ~ Ions } are trapped in { TAIL ~ a potential well } in the linear trap 30 and are bunched at the bottom of the potential well adjacent an exit segment 50
HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH