Example of the light curve processing for the star KIC 5780885. Panel a: approximation of the transit background (open squares) with a sixth-order polynomial F_b (t_k) (solid line); panel b: phase-folded TLC, ΔF(Δt), with near-transit border parts BP1 and BP2 indicated (blue boxes); panel c: clipped border parts (labeled) vs. the border distance δt ready for comparison. The black horizontal bar in (c) corresponds to the radius ingress (egress) time of the planet.