Stat > DOE > Response Surface > Overlaid Contour Plot > Contours
Define the low and high values for the contour lines for each response.
For a discussion, see Defining contours.
Response: Lists the responses that you have selected to display on the overlaid contour plot.
Low: Enter the low value for the contour lines for each response.
High: Enter the high value for the contour lines for each response.