The Parameters Settings allow you to keep parameters (such as reference line or average traces) constant in each diagnostics window or to vary the parameters from one diagnostics window to another. Click <Parameter Setting> in the lower right-hand corner of the Tie with Diagnostics window.
Place a check mark next to the options you wish to keep constant in the Correlation, Power Spectrum, Coherence, and Wavelet Matching/Transfer Function tabs. For example, if you place a check mark next to Use the Same Setting under Smooth Spectrum, then any changes you make to the smooth spectrum settings in the Wavelet Matching/Transfer Function tab will also be applied to the Power Spectrum tab. If you remove this check mark, you can have different values in the two tabs.