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Up: 12. UV Plane Analysis
Previous: 12.1.2 How to create
A procedure is available to do various plots from a continuum or line
table. Its name is UVALL and it is called by clicking on
``Interferometric UV operations'' in the GRAPHIC standard menu. One
has to select the first and last channel to be plotted (0 0 to get
all channels) and the name of the parameters to be plotted in
abscissa and ordinate. The following examples are the most useful
plots:
- uv coverage:
- to get an idea of the imaging quality that may
be obtained, to check if one configuration has been forgotten, ...
Figure 12.2:
Example of a
uv coverage plot
![\resizebox{14.0cm}{!}{\includegraphics[angle=270]{rl3f1.eps}}](img943.gif) |
- weight vs. number:
- check if some data got strange weights
(e.g., zero) for any reason
Figure 12.3:
Weight versus
visibility number plot
![\resizebox{14.0cm}{!}{\includegraphics[angle=270]{rl3f2.eps}}](img944.gif) |
- Amplitude vs. antenna spacing:
- quite useful if a source is
strong to see if it looks resolved. Also check for spurious high
amplitude points.
Figure 12.4:
Amplitude
versus antenna spacing plot
![\resizebox{14.0cm}{!}{\includegraphics[angle=270]{rl3f3.eps}}](img945.gif) |
- Amplitude vs. weight:
- another useful check: spurious
high-amplitude points with non-negligible weight can cause a lot of
harm in a map.
These plotting facilities are also implemented in the MAPPING program
as a command (SHOW UV).
Next: 12.3 Data editing
Up: 12. UV Plane Analysis
Previous: 12.1.2 How to create
S.Guilloteau
2000-01-19