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In page Multitaper:

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This technique is currently used in the spectral analysis toolkit of Chronux. An extensive treatment about the application of this method to analyze multi-trial, multi-channel data generated in neuroscience experiments, biomedical engineering and others can be found here. Not limited to time series, the multitaper method can be reformulated for spectral estimation on the sphere using Slepian functions constructed from spherical harmonics[1] for applications in geophysics and cosmology[2][3] among others.