LS, CLEAN, and Period04 power spectra of J130559 obtained from the TESS data for (a) sector 64 and (b) sector 65. The significant signals are distinctly marked. A zoomed-in plot corresponding to the orbital (Ω), negative superhump (SH₋), and retrograde disc-precession (${\mathrm{\Omega }}_{\text{pr}}^{\text{-}}$) frequencies is also shown on the right. All observed frequencies in the power spectra lie above the 95% confidence level, which is represented by the dashed horizontal green line.