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1. In relation to cathode-ray tube displays, errors in the signal's amplitude, phase or both that result in small, rapid aberrations in size or position of the image. 2. Errors of synchronization between a facsimile's transmitter and receiver that are characterized by a raggedness in the copy. 3. Small spurious variations in a waveform, such as in pulse repetition rate, amplitude, frequency or phase, that stem from supply-voltage variations, mechanical instability and other factors.
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