Panel a: mean power spectrum of the window functions . The power spectrum is normalized to unity at (m, ω) = (0, 0). The maximum value of each peak is written right next to the peak. The frequency offset between the peaks with adjacent m is (Ω_eq − Ω_⊕)/2π = 421.41 nHz. Panel b: cut at m = 0 through the power spectrum from panel a. Panel c: maximum power of the peaks as a function of m, depicting the spatial leakage.