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There are several steps that can be taken to eliminate the empty space above and below text in Flutter:

1. Use the Text widget with the textAlign and textScaleFactor properties to center and adjust the font size of the text.

2. Use the SizedBox widget with the height property to adjust the height of the container that holds the text.

3. Use the Padding widget with the padding property to adjust the spacing between the text and the container.

4. Use the FittedBox widget with the fit property set to BoxFit.scaleDown to scale the text to fit the container.

5. If the above steps do not solve the problem, use the Align widget to position the container that holds the text within the parent widget.

Overall, it may require experimenting with different combinations of these techniques to find the solution that works best for your specific layout and text content.