O − C diagrams (left panels) and phase-folded TTV curves (right panels) for the short-term periodic TTV candidates from the full dataset. The gray dashed line marks the best-fit linear ephemeris, and the blue line shows the sine model with the fitted amplitude A_TTV value annotated. Data points are color coded by source. The linear trend in the O − C panels arises from the difference between the sine model reference epoch and the linear ephemeris given in Table 4.