| http://www.w3.org/ns/prov#value | - The output frequency of the power supply 72 is selected to cause the wavelength, ??c, of the standing wave 62 (or of a subharmonic thereof) to be approximately twice the desired center-to-center displacement or pitch, p, of adjacent pixels in the printed image (i.e., p=??c /2N, where N is a positive integer).
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