To display a surface plot for a response surface design
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1    Choose Stat > DOE > Response Surface > Surface Plot.

2    In Response, choose the response variable for the z-axis.

3    Under Variables, in Y Axis, choose the variable for the y-axis.

4    Under Variables, in X Axis, choose the variable for the x-axis.

5    If you like, use any dialog box options, then click OK.