Fourier frequency spectra for the pixel photometry of OGLE-BLAP-001 made using TESS FFIs in four sectors (labelled, four upper panels) observed with 10 min (Sectors 36 and 37) and 200 s (Sectors 63 and 64) cadences and for the combined Sector 63 and 64 data (the lower panel). Drops in signal at low frequencies are due to the strong detrending of the data. The drops are reproduced in the vicinity of the frequency of (10 min)⁻¹ = 144 d⁻¹ for the 10 min cadence data, twice the Nyquist frequency of 72 d⁻¹, marked with the vertical dashed lines.