To set the holding levels for variables not in the plot
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1    In the Overlaid Contour Plot dialog box, click Settings.

2    Do one of the following to set the holding value for extra components or process variables:

·    For process variables:

-     To use the preset values for factors, covariates, or process variables, choose High settings, Middle settings, or Low settings. When you use a preset value, all variables not in the plot will be held at their high, middle (calculated median), or low settings.

-     To specify the value at which to hold the factor, covariate, or process variable, enter a number in Setting for each of the design variables you want control. This option allows you to set a different holding value for each variables.

·    For components:

-     To use the preset values for components, choose Lower bound setting, Middle setting, or Upper bound setting under Hold components at. When you use a preset value, all components not in the plot will be held at their lower bound, middle, or upper bound.

-     To specify the value at which to hold the components, enter a number in Setting for each component that you want control. This option allows you to set a different holding value for each components.

3    Click OK.