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Binary plot extraction systems are used in contemporary radar systems as an economical means for providing information on the presence and position of targets, by combining data from all the pulses during one scan of the beam. The paper assesses the performance of two binary plot extraction systems employing digital integrating counters. It is shown how to obtain probability of detection curves for constant point targets and point targets exhibiting scan-to-scan or pulse-to-pulse fading. The measurement of azimuth is also discussed and the error involved is evaluated.