The differences between synthetic planetary transit light curve as a function of stellar atmospheric extension for different transit inclinations. Left: average differences between synthetic planetary transit light curves computed using model stellar atmosphere CLIV or using best-fit quadratic limb-darkening laws as a function of atmospheric extension for the TESS band (top) and K band (bottom). Right: same as the left panels, but for the RMS difference of the light curves. The red crosses represent transits with μ₀ = 1, blue stars those with μ₀ = 0.3, and black open squares those with μ₀ = 0.7. For each inclination, we show twenty chains of atmospheric extension.