Total power spectra (gray curves) in log-log scale obtained using TESS-21 (top panel), Kazan-22 (middle panel), and TESS-23 (bottom panel) observations. The red circles show the averaged power spectra. The magenta lines show the power law with an exponent of −2, and the blue curves are the fits of the excess power spectra, represented by the formula (2) with the parameters A = 5, ν_c = 90 d⁻¹, and γ = 2.2 (TESS-21), A = 2.7, ν_c = 90 d⁻¹, and γ = 2.2 (Kazan-22), and A = 7, ν_c = 72 d⁻¹, and γ = 2.2 (TESS-23).