Extracting Parts of the Signals
There are two ways to extract a part of the signal into a new window:
Edit/Extract signal part (from-to) option from the menu. A dialog appears where you define limits of the part you want to extract (the units are the same as X-axis units of a signal). A new window with the extracted part of the signal will appear. It will always contain part of the origin signal (for example, 1000-2000Hz part from FFT sequence) that you defined in the Extract dialog. It is useful for extraction of one part of the spectrum in a separate window. You can use it to observe several frequency ranges in separate windows and calculate their statistics values.
Edit/Open selection in new window option from the menu. Select part of the signal and choose this option from the menu or press Alt+E. A new window with the extracted part of the signal will appear. It will always contain part of the origin window which was selected in the moment of creation. It is useful for quickly extracting some visible part of the signal. For example, you can select the middle 1/3 of the window. No matter how the content of the origin window changes (zoom in/out, recalculation), the extracted part will always contain the middle 1/3 of the origin window, regardless of units or current values on the X-axis.