14 × 14 pixel FFI cutout showing the Cycle 1 field containing the Cepheid Gaia DR3 5340164256296564736, indicated by the red cross. The circles are NGC 3532 members, where the size of the circle is related to the star’s G magnitude, with larger circles being brighter. The colors of the circles are based on the P_rot we measured; yellow circles are cluster members for which we do not measure any P_rot because they are too faint, while the black crosses are members for which we measured a 2.1 days P_rot that is inaccurate and caused by contamination from the Cepheid. This example demonstrates how bright and rapidly varying sources can prevent accurate P_rot measurement for nearby targets when using TESS data.