Result of the light curve test for the planet-to-star radius ratio parameter, k = R_planet/R_star. The ordinate is the S/N-ratio defined by Eq. (34). The y-axis is the difference between the simulated and the retrieved planet-to-star radius ratio values (k = R_planet/R_star). The red and blue points are the small super-Earths and Earths with 0.015 < k < 0.03 (red) and 0.005 < k < 0.015 (blue). We note that these radius ratios correspond to Super-Earth- and Earth-sized (red) as well as Neptune-sized (blue) planets around a solar-sized star. We also note that the horizontal dashed lines denote ±2% relative errors in the radius ratio. For bigger companions, black dots denote the solutions where the stellar radius value was obtained with a 3% accuracy relative to the injected stellar radius, while gray points represent the cases where we had obtained them with a 3–6% accuray.