Spectral Line Imaging Considerations

Although you do not have to decide whether to use MFS or not for spectral line observations (clearly you cannot), there are a few other issues you must consider. These are discussed in Chapter 15 in more depth -- we only list some pointers here. Some questions to ask yourself are:

• Do I need to remove the continuum from the visibility data?
• Is the velocity information in the dataset correct? What velocity system convention am I interested in?
• Do I need to account for the Doppler effect caused by the Earth's motion?