plotting visibilities

[SpheMakh]

The standard plots are:

• Amp vs Antenna
• Amp vs Scan
• Amp vs Frequency (average in time)
• Phase vs Frequency
• Amp vs Phase
• Real vs Imaginary
• Amp vs uvdist ( both in metres and wavelengths)
• Phase vs uvdist ( both in metres and wavelengths)

Average over these axes:

• Time
• Frequency
• baseline

Iterate over these axes:

• scan
• spectral window
• correlation

[o-smirnov]

OK, so for the "iteratable" axes, you want to have two options:

• select a range of scans (all by default)

• put all selected scans into one plot

• put each scan (from the selection) into a separate plot

And you kind of want to implement that generically for all three, i.e. scan, spectral window, correlation.

[Mulan-94]

Amplitude Phase vs UV / Frequency

[o-smirnov]

Also, for averaging over time and frequency, the user needs to be able to specify the averaging interval (in seconds/MHz, or in number of bins or channels).

Averaging needs to be done on the final quantities (such as amplitude, real, imaginary, phase), or pehaps on the visibilities themselves. Check the CubiCal code for visibility averaging.

@Mulan-94 @SpheMakh but do investigate how exactly CASA averages when making phase plots, as there's many subtleties there.