| http://www.w3.org/ns/prov#value | - Apparatus as claimed in claim 1 and in which the waveform of the illuminating wave energy is adjusted to produce a relatively small (say less than 2) error parameter Ep given substantially by the expression. ##EQU7## where xs is the sth sample of the illuminating waveform, xn+1 is the first nontrivial outgoing wave sample, and n is an integer.
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