Deflection control structure has {TAIL ~ holes} through which {HEAD ~ the beams} may pass with a set of x y deflection electrodes associated with each of the holes for x y control of the trajectory of each of the beams 
through pass
Deflection control structure has { TAIL ~ holes } through which { HEAD ~ the beams } may pass with a set of x y deflection electrodes associated with each of the holes for x y control of the trajectory of each of the beams
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL REL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH