| http://www.w3.org/ns/prov#value | - The convergence adjusting apparatus comprises basic waveform signal generating means for generating a sawtooth waveform signal as a first order waveform signal, a parabolic waveform signal as a second order waveform signal and an n-th order waveform signal, where n is an integer equal to or greater than 3, the sawtooth waveform signal, the parabolic waveform signal and the n-th order waveform sign
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