MS Options — Display Axes

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7.4.1.3 MS Options — Display Axes

This roll-up is very similar to that for images: it allows the user to choose which axes (from Time, Baseline, Polarization, Channel, and Spectral Window) are are on the display and the animator. There are also sliders here for choosing positions on the remaining axes. (It’s useful to note that the data is actually stored internally in memory as an array with these five axes).

Figure 7.21: The MS for NGC4826 from Figure 7.20, now with the Display Axes open in the Data Display Options panel. By default, channels are on the Animation Axis and thus in the tapedeck, while spectral window and polarization are on the Display Axes sliders.

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For MSs, changing the choice of axis on one control will automatically swap axes, maintaining different axes on each control. Changing axes or slider/animator positions does not normally require pressing Apply — the new slice is shown immediately. However, the display may be partially or completely grey in areas if the required data is not currently in memory, either because no data has been loaded yet, or because not all the selected data will fit into the allowed memory. Press the Apply button in this case to load the data (see § 7.4.1.6 and Max. Visibility Memory at the end of § 7.4.1.5).

Figure 7.22: The MS for NGC4826, continuing from Figure 7.21. We have now put spectral window on the Animation Axis and used the tapedeck to step to spw 2, where we see the data from the rest of the scans. Now channels is on a Display Axes slider, which has been dragged to show Channel 33.

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Within the Display Axes rollup you may also select whether to order the baseline axis by antenna1-antenna2 (the default) or by (unprojected) baseline length.

See Figures 7.21–7.22 showing the use of the Display Axes controls to change the axes on the animation and sliders.

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