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Data examination and inspection

Once the data have been filled to a MeasurementSet, they can be examined or displayed using various tools. The Catalog tool provides an overview of AIPS++ data files at the highest level, as individual AIPS++ tables of different types (e.g. images, MS, etc) in a given directory. To bring up the Catalog tool (Fig. 1.4) using Glish type:

include 'catalog.g'
dc.gui()                     # dc is the default catalog tool.

**Figure 1.4:** The Catalog GUI showing example MeasurementSets that have been created with the vlafiller tool.
$\begin{figure}% figure {catalog} \epsfig{file=cookbook.dir/vla.catalog.ps, height=4.0in}\hrulefill \end{figure}$

When you click on the View button (to view the presently selected catalog item) you will launch the tablebrowser which provides facilities to browse and examine all data fields in the MS main and sub-tables.

Note that indices in the MS, such as FIELD_ID, are stored as integers beginning with zero when viewed at the low level provided by the tablebrowser. All AIPS++ synthesis tools correct for this artifact of C+ + and present selection of indices beginning at one.

The primary graphical visibility data visualization tool in AIPS++ at present is msplot. msplot allows line and raster plots of the observed, corrected, and model data against a range of MS indices and parameters, as well as associated plots such as uv-coverage. Facilities are provided to support versatile data selection, range setting and plot iteration. Interactive editing is also supported, as described in the next section.

Subsections

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