Results from a search for periods around the orbital one in TESS 21 light curves. Left panels: Periodograms of the observed (top panel) and pre-whitened by the ν⁻ frequency (bottom panel) light curves of the TESS-21 observations in the frequency range of 5–10 d⁻¹. The strongest peaks corresponding to the negative (ν⁻) and positive (ν⁺) superhumps and the orbital variability (ν_orb) are labeled. The position of the ν_orb frequency in the top panel is shown by the vertical dashed line. Right panels: The TESS-21 light curve folded with the negative (top panel) and positive (bottom panel) superhump periods. The phase-binned light curves and their best sinusoid fits are also shown.