(a) TESS TPF of TOI-2155 (TIC 461591646) from Sector 60, illustrating the pixel-level flux distribution within the field. The red outlines mark the SPOC photometric aperture, and the numbered markers identify nearby Gaia DR3 sources, with marker size scaled by the relative brightness difference (Δm) with respect to the target. The target star (TOI-2155) lies near the center of the aperture, and the flux is strongly concentrated in the central pixels, indicating that the extracted photometry is dominated by the target star. (b) Flux contamination analysis from tess-cont, computed using the TESS pixel response function together with nearby Gaia DR3 sources. The target star (TOI-2155) contributes ∼96.9% of the total flux within the adopted aperture, whereas nearby stars account for only ∼3.1% contamination. Among the nearby contaminating sources, Star 2 contributes the most flux to the aperture contamination.