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A command to query the selected Spectrum object.
The (normalized) skewness of a spectrum is the third central moment of this spectrum, divided by the 1.5 power of the second central moment. See Spectrum: Get central moment....
The skewness is a measure for how much the shape of the spectrum below the centre of gravity is different from the shape above the mean frequency. For a white noise, the skewness is zero.
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