21. Often the Fourier transform is converted to the power spectrum , which is the magnitude of each frequency component squared. 22. Then a diffraction pattern is created by using the power spectrum function in Digital Micrograph software ( middle ). 23. The Fourier transform of the second-order cumulant, i . e ., the autocorrelation function, is the traditional power spectrum . 24. The only unknown in this expression, F, can be determined by fitting this expression to the experimental power spectrum . 25. Systems that show QPOs sometimes also show nonperiodic noise that appears as a continuous curve in the power spectrum . 26. It is common that the ( cross-) power spectrum is well approximated by a power law of the form 27. It is contaminated by the presence of the power spectrum of foreground components, so that the total power spectrum is: 28. It is contaminated by the presence of the power spectrum of foreground components, so that the total power spectrum is: 29. Although, the power spectrum efficiency of a non-constant amplitude envelope is always higher than that of a constant envelope modulation. 30. The calculation of the non-linear matter power spectrum poses another challenge for weak lensing measurements and must include baryonic effects.
