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UV-Table Creation

Figure: Write a UV Table, in the CLIC menu.

Image pdbi-cookbook-17

A uv-table with calibrated source visibilities can be created by selecting ``Write a UV Table'' in the CLIC menu (Fig. [*]). A widget similar to the one shown in Fig. [*] is opened. The hpb file name, table name (with no extension), source name, receiver band, tuned side band and table mode (with spectral -LINE- or without spectral -CONT- information) are to be specified. In the widget, the atmospheric phase correction must be disabled if it was not taken into account in the calibration. The rest frequency can be redefined, as well as the table resampling for the LINE mode. A uv-table is newly created if the option New Table is set on; visibilities are added to an existing uv-table if the option New Table is set off.

This procedure creates (or includes) the selected calibrated source visibilities into the specified uv-table, but also creates (or updates) a clic procedure, which can be executed by entering ``@mytable-table.clic'' in CLIC to produce the same table (of name ``mytable'' in this example). Editing a script to create tables (the file ``mytable-table.clic'' in our example, see Fig. [*]) is easy and likely faster than filling in all the options available in the widget to create tables. This clic procedure defines the hpb file, calibration and table settings, selects the correlations on source, and finally uses the CLIC command ``table'', possibly with the options ``/resample'' and ``/frequency''. In the CLIC menu there exist other more complex procedures to create tables, but likely none of them is as fast and flexible as editing table scripts is.

Particularly for mosaics a table must be created for each observed offset, all of them with a generic common name followed by an offset number (an example is shown in Fig. [*]). The imaging MAPPING procedures (presented in Sect. [*]) will so recognize the mosaic and properly proceed with the imaging.


next up previous contents
Next: Calibrating and/or merging with Up: Data Calibration with CLIC Previous: Data quality assessment   Contents
Gildas manager 2018-09-24