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Rev 89703 Rev 90259
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  The spectrum here is defined (for historical compatibility) with
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  The spectrum here is defined (for historical compatibility) with
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  scaling \code{1/\link{frequency}(x)}.
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  scaling \code{1/\link{frequency}(x)}.
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  This makes the spectral density a density over the range
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  This makes the spectral density a density over the range
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  \code{(-frequency(x)/2, +frequency(x)/2]},
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  \code{(-frequency(x)/2, +frequency(x)/2]},
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  whereas a more common scaling is \eqn{2\pi}{2pi} and range
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  whereas a more common scaling is \eqn{2 \pi} and range
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  \eqn{(-0.5, 0.5]}
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  \eqn{(-0.5, 0.5]}
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  \bibcitep{e.g.,|R:Bloomfield:1976|} or 1 and range
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  \bibcitep{e.g.,|R:Bloomfield:1976|} or 1 and range
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  \eqn{(-\pi, \pi]}{(-pi, pi]}.
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  \eqn{(-\pi, \pi]}.
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  If available, a confidence interval will be plotted by
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  If available, a confidence interval will be plotted by
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  \code{plot.spec}: this is asymmetric, and the width of the centre
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  \code{plot.spec}: this is asymmetric, and the width of the centre
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  mark indicates the equivalent bandwidth.
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  mark indicates the equivalent bandwidth.
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}
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}