{HEAD ~ The present invention} is {TAIL ~ a signal observation system} for controlling a plurality of receiver channels simultaneously 
is
{ HEAD ~ The present invention } is { TAIL ~ a signal observation system } for controlling a plurality of receiver channels simultaneously
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH