{HEAD ~ The diode} is non conductive during line scanning periods and conductive during {TAIL ~ that period} of line blanking periods in which current peaks produced by the anti comet tail gun occur 
is conductive during
{ HEAD ~ The diode } is non conductive during line scanning periods and conductive during { TAIL ~ that period } of line blanking periods in which current peaks produced by the anti comet tail gun occur
HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH