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Once you've constructed a summary table, put each variable in its proper place, and selected statistics, you may want to change the way the table looks. In the Preview area of the Summary Tables window, you can change many properties of headers and data values.
To modify an existing report, right-click the Summary Tables task icon in the Project Tree or Process Flow, and select Modify Summary Tables from the pop-up menu. The Summary Tables window will open. To display the Preview area, click the Summary Tables option in the selection pane on the left.