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The Energy-time Curve is computed by first transforming from time domain to frequency domain.
If 
is
checked, this transform is performed faster using a Fourier transform with a
data length of an order of two. The data are padded with zeros to get this
length. This may introduce an error if the signal contains a DC-component.
After the Fourier transform, a window may be applied to the complex frequency data before performing the inverse transform. The following choices are possible:
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