Flux errors resulting from the small-body approximation with linear interpolation. Left: For R_p/R_s = 0.05, the maximum distance between the center of the stellar disk and the occulting body that provides errors < 1 ppm is ɀ = 0.65. Right: For R_p/R_s = 0.02, flux errors are < 1 ppm up to z = 0.95. Black curves are realizations for 1400 optical limb darkening coefficients of all stellar types (Claret 2017).