Access the Correlation chart's configuration dialog box and select the Chart tab. For each of the three tabs on the Chart tab (Confidence Bands, Prediction Ellipse, and Regression Line), configure the following:
Select the Display check box to show the function.
From the Confidence Limit list box, select the confidence limit percentage (for Confidence Bands and Prediction Ellipses only).
To change the color of the line, click the Color button and select from the color palette.
To change the width of the line, select a value from the Line Width list box (5 is the widest line).
To change the style of the line, select an option from the Line Style list box.