TESS LCs of ET Cru obtained in five sectors (11, 37, 38, 64, and 65), with exposure times of 1800 s, 600 s, 600 s, 200 s, and 200 s from top to bottom, respectively. Only data points passing the quality_mask=’hard’ criterion are shown. The LCs exhibit noticeable variations in overall flux levels and amplitudes between different sectors and cadences, particularly outside eclipse phases, suggesting the presence of systematic effects.