Velocity resolution

  The effective resolution can be obtained by multiplying the channel spacing by the `Resolution factor' in table 3. Although Natural weighting gives the best resolution, it can also produces wings (both positive and negative) in the spectra which are up to 22% of the peak brightness. This will only affect data with frequency components of width similar to the channel spacing, and is therefore seen on sharp interference spikes. To change method, change the appropriate line in the ICF. The default is Natural. A Naturally-weighted spectrum may also be Hanning smoothed in SPECX to reduce the sidelobes.

  
Table 3: Effective resolution factors