After ionization, {TAIL ~ all the ions} can be easily directed to the collection plates by an electric field formed from {HEAD ~ the parallel plates} 
After ionization , { TAIL ~ all the ions } can be easily directed to the collection plates by an electric field formed from { HEAD ~ the parallel plates }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD