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Version 1.9 Build 1488

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Useful tips

• For synthesis data, set Data selection/Show Zero Spacing to False to avoid the scale being dominated by the zero spacing points.
• To find the position angle of a feature, use the Plot of Y (data) versus reprojected U axis. Set the number of plots to be 18, and you will see the visibility function plotted for increments of ten degrees.
• Some of the entry fields have graphical tools to help in setting: Data selection/Antennas, Data selection/Interferometer Number, Data selection/Field Id. As is standard throughout AIPS++, these are accessed via the wrench menu on the right end of each entry widget.
• Data selection/Antennas and Data selection/Interferometer Number have different purposes and usually should not be used together. The former allows all data from a set of antennas to be selected, whereas the latter allows more detailed control over which antenna pairs are to be selected.
• The ranges in the Data selection frame are evaluated by selecting with the current selections, and then finding the ranges. The initial values are calculated with no selection. Use the Update button on the Data selection frame to update the Ranges for the current selection. For example, suppose that you wish to find the range of observed times for a given field id. Set the field id as desired and then press the Update button. The next press of the Range button for the Time will fill in the time range for that field id.
• In both the Spectral selection and Polarization selection frame, the initial values for some of the parameters are filled in when a value is entered in the List entry box.
• To find outlier points with the plotter, use the same steps as you would for flagging but press Locate instead of Flag. The selected points will be identified in the logger.