GLS periodograms of the TESS observations of IGR J16194−2810. The frequency with the highest power is highlighted in red. These periodograms correspond to the first (top) and second (middle) portion of the Sector 12 TESS observations, and to Sector 39 observations (bottom). The horizontal dashed black lines represent 3σ detection probabilities. The right-hand panel shows the light curve folded at the 242.839 min period and binned at 80 bins/cycle.