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Let's begin by selecting Planes Along Axes, by clicking the left mouse button on the diamond next to that selection. Yet another dialog box appears.

Figure 4 Cartesian Display Mode Dialogue Box

Begin your exploration of the Cartesian Display Mode by changing the Plane ID to 25 and then left clicking on Spread. This will cause an xy raster map and a corresponding spreadsheet display of the data values in the xy-plane z=25.

Figure 5 Cartesian Spread Sheet

The palette with which the image is originally displayed will probably be either a gray scale palette or the system palette. To better expose the details of this data set, left click on the Palette button of Figure 5 and either experiment with building a custom palette or loading a palette from a file. See the X Image Quick Start document for more details on palette construction and manipulation.

Now that you have a display of the raster map and the associated spreadsheet, experiment with panning over the spreadsheet with the vertical and horizontal scroll arrows and scroll bars. Also, click the left mouse button on a point of interest in the raster map and note how the spreadsheet snaps to that position. The ability to interact with a data set both visually and numerically is often a great aid when debugging a troublesome computer code. When finished exploring some of the capabilities of the Cartesian Spread Sheet, left click on the Close button to return to the dialog box of Figure 4.

Next, investigate the Frame feature of XDS's Cartesian Display Mode. Change the Frame Increment from 1 to 5 and select 10 for the No. of Frames. Then left click on the Frame button.

Figure 6 Ten Frames of Data Along the Z-Axis

As Figure 6 illustrates, this gives a view of ten planes of data values, with the planes all parallel to the xy-plane and intersecting the z-axis at z = 25, 30, ..., 70. This visualization technique is quite valuable in helping one to identify patterns and trends in three dimensional data sets. The Tile and Unfolded options of Figure 4 provide the opportunity to inspect various planes of data in a fashion similar to the Frame option. Experiment with them. Before attempting to use the Animate feature, consult the NCSA X DataSlice Users Guide.