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FIGURE 6.2 Receiver operating characteristic for the Gaussian example: (a)
displayed on a linear P scale, (b) displayed on a logarithmic P scale.
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FA
If the achievable combinations of P and P do not meet the performance
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D
specifications, what can be done? Consideration of Fig. 6.1 suggests two
answers. First, for a given P , P can be increased by causing the two PDFs to
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move further apart when a target is present. That is, the presence of a target must
