Step 4.Click on the appropriate check marks 
to hide all the fields except the County, Pop1990, and McdCounty.(To make a field visible again, just click once more in the same cell.)
Step 5. Click 
to apply your changes to the theme table.
Note: The unchecked fields are no longer displayed, and only the checked visible fields remain. This is usful tool if you only need certain attributes displayed.
Step 6. Close ArcGIS or continue with the next exercise.
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