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Distribution of the differences between the predicted wavelength (using three algorithms) and the actual wavelength of stationary periodic signals (yellow) and non-stationary periodic signals (blue). Log transformation for the difference (Δτ) was carried out using ln(1+|Δτ|). The errors of wavelength prediction by ARSER and COSOPT were low and close to zero, while those for Fisher's G-test were high and in a wide range.
