Variation of the S/N ratios of the tfa+dft (SNR₁) and tfadft (SNR₂) spectra as a function of the injected signal frequency for the two-component time series described in the text. The shading is proportional to SNR₂ as indicated by the sidebars. For realistic (noisy) time series, the signal detection capability of the two methods become nearly the same. The result shown in the bottom panel is based on 10 realizations of the Gaussian noise added to the time series.