This item of the Manipulate menu is available only if the active function plot window contains a smoothed response function, with one or more added foreign response functions as explained in Section 4.3.21.
Smoothed response functions are always interpreted as temperature changes between a low powered and a high powered state. The original response function is automatically normalized and displayed as a change between zero to a maximum temperature.
Zth curves are displayed in the same way but the temperature change is normalized by the power step.
Added foreign functions can be shifted automatically in the plot using this menu item in a way that the hot or cold ends of the functions fit thus enabling easier comparison of different curves.
Figure 4-50: Fitting measured transients at their hot end
