Phase-folded TESS curves from the transit fitting process. Top panel: phase-folded light curve of the transit of KELT-20 (gray points), along with the binned data (purple points) and the transit model (blue curve). The black vertical lines display the t₁ and t₄ contact points of the transit. Bottom panel: phase-folded TESS light curve for the secondary eclipse of KELT-20 b. The red dashed line dictates the location of P/2, and the black vertical lines dictate the t₁ and t₄ contact points of the transit.