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Global Spectral Analysis

Real spectral analysis
`SHPowerL`	Compute the power of a real function for a single spherical harmonic degree.
`SHPowerDensityL`	Compute the power spectral density of a function for a single spherical harmonic degree.
`SHCrossPowerL`	Compute the cross-power of two functions for a single spherical harmonic degree.
`SHCrossPowerDensityL`	Compute the cross-power spectral density of two functions for a single spherical harmonic degree.
`SHPowerSpectrum`	Compute the power spectrum of a function.
`SHPowerSpectrumDensity`	Compute the power spectral density of a function.
`SHCrossPowerSpectrum`	Compute the cross-power spectrum of two functions.
`SHCrossPowerSpectrumDensity`	Compute the cross-power spectral density of two functions.
`SHAdmitCorr`	Calculate the admittance and correlation spectra of two functions.
`SHConfidence`	Compute the probability that two sets of spherical harmonic coefficients are correlated at a given degree and for a given correlation coefficient.
Complex spectral analysis
`SHPowerLC`	Compute the power of a complex function for a single spherical harmonic degree.
`SHPowerDensityLC`	Compute the power spectral density of a complex function for a single spherical harmonic degree.
`SHCrossPowerLC`	Compute the cross-power of two complex functions for a single spherical harmonic degree.
`SHCrossPowerDensityLC`	Compute the cross-power spectral density of two complex functions for a single spherical harmonic degree.
`SHPowerSpectrumC`	Compute the power spectrum of a complex function.
`SHPowerSpectrumDensityC`	Compute the power spectral density of a complex function.
`SHCrossPowerSpectrumC`	Compute the cross-power spectrum of two complex functions.
`SHCrossPowerSpectrumDensityC`	Compute the cross-power spectral density of two complex functions.

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