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# Smooth Line Properties

In a chart that displays lines (Line type or XY type), you can choose to show curves instead of straight lines. Some options control the properties of those curves.

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In the Chart Type dialog of a Line chart or XY chart that displays lines, choose Stepped in the Lines type dropdown, then click the Properties button.

Press Shift+F1 and point to a control to learn more about that control.

## To change line properties

1. Select Cubic Spline or B-Spline.

   These are mathematical models that influence the display of the curves. The curves are created by joining together segments of polynomials.

2. Optionally set the resolution. A higher value leads to a smoother line.

3. For B-spline lines optionally set the degree of the polynomials.