Table 4.

Expert recommendations for other processing operations.

Name of operation	Recommendation
Fourier tansformation	- An implementation of a discrete Fourier transformation, such as the fast Fourier transform (FFT) should be used to convert the time-domain FID signal into a spectrum. - Conversion from the spectral domain back to the time domain should be performed using the inverse discrete Fourier transform.
Phasing	- Some common data analysis packages perform an automated phasing step prior to fitting, so it is often not necessary to perform a phasing step in advance of spectral analysis. - Phasing should generally be performed prior to displaying or inspecting a spectrum to enable easy visual interpretation. - Both manual and automated phasing routines are equally acceptable, but, visual verification of automatic phasing results is recommended.
Apodization	- Apodization can be useful for visualization purposes. - Not recommended to apodize data prior to spectral analysis – this can invalidate statistical assumptions associated with the fitting model.
Zero-filling	- Zero-filling before spectral analysis is not recommended. - May be helpful prior to some other processing routines such as peak fitting for linewidth estimation or center frequency estimation. - Use of zero-filling is recommended if increased digital resolution is required.