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To modify the appearance of the data series using the C1Chart floating toolbar, complete the following steps:
Select the C1Chart control and click on the Open button to open the C1Chart floating toolbar if it is not already open.
Select the Data drop-down arrow from the C1Chart floating toolbar and choose the Edit data series item.
The Chart Properties designer appears for the data series.
Select Series0 and click on the drop-down arrow for the Line property. Modify its Color, Line style, and Width style for its Line property to the following:
Select OK and the new changes for series 0 appears on the chart.