Example of AFINO results applied to the integrated light curve of the EUV brightening shown in Fig. 6 a. The blue line represents the Fourier power of the light curve, while the orange line indicates the best fit for each model: S₀ (left), S₁ (centre), and S₂ (right). The red vertical dashed line in Model S₁ marks the Gaussian centre corresponding to the dominant period, and the green dashed lines represent the 95% confidence interval. The BIC differences are ΔBIC_{S0 − S1} = −1.1 and ΔBIC_{S2 − S1} = −15.3. Model S₂ provides the best fit to the Fourier power.