Dear hgmohmed,
The X axis created by default is at the bottom of the graph. To move X axis to the middle, you can double click on the X axis to open X axis dialog box. Go to Title & Format tab. Make sure Bottom is selected in the Selection box. Select At Position = from Axis Position drop-down list, and type 0 in the Percent/Value edit box, like the graph shown
Click OK to apply.
Sincerely, Amanda
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