To control plotting of contour levels (mixture design)
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1    In the Contour/Surface Plots dialog box, check Contour plot and click Setup.

2    Click Contours.

3    To change the number of contour levels, do one of the following:

·    Choose Number and enter a number from 2 to 11.

·    Choose Values and enter from 2 to 11 contour level values in the units of your data. You must enter the values in increasing order.

4    Click OK in each dialog box.