To display a contour plot for a factorial design
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1    Choose Stat > DOE > Factorial > Contour 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.