{HEAD ~ Ions}, neutral particles, and macro particles generated by the cathodic arc flow into {TAIL ~ the magnetic duct} where substantially all the neutral and macro particles are removed 
{ HEAD ~ Ions } , neutral particles , and macro particles generated by the cathodic arc flow into { TAIL ~ the magnetic duct } where substantially all the neutral and macro particles are removed
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH