The 'Calculate amplitude/phase variations' dialog
This dialog appears when you press the "Calculate amplitude/phase variations"
button in the Fit module. It offers the possibility to
calculate amplitude and/or phase variations.

Calculation settings:
- Attribute to use:
Defines the attribute that contains the
time string subdivision that should be used for the calculation.
- Type of variations:
Select either "amplitude variations", "phase
variations" and "amplitude and phase variations" here.
- Parameters to improve:
By default "all ampl. & phases" is
selected. That means that for this calculation the frequencies will be kept fix
and all amplitudes and phases are redetermined. To set an other selection
click on "special" and make your choice in the selection dialog that will be opened.
Press Calculate to start the calculation using the defined settings. The
results will be displayed in the text field.
You may print or export the results to a file by clicking the appropriate
button at the bottom.