Ocean Optics NanoCalc - Manual (Page 51)

Ocean Optics Germany GmbH Thin Film Metrology
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2. subtract mean value
The mean level of the measured signal is adjusted to the level of the simulated signal, but NOT the
frequency or the amplitude or the slope of the signal. This option is quite useful if for some reason there is
a slight constant offset between signal and simulation.
4. subtract mean value and adjust slope
The level and the amplitude and the slope of the measured signal are adjusted to the level of the
simulated signal, but NOT the frequency of signal modulation.
Only the frequency of the wiggles remains as information. Think about using the FFT method instead.