Examples of simulated transit light curves. Left panel: the curve shows a transit of a planet with radius R_p = 12 R_⊕ (similar to that of Kepler 1625b) for a low level of noise (100 ppm). The red curve shows a similar but different planetary transit, and an exomoon transit is superimposed (R_m = 4.75 R_⊕). Right panel: simulations for a higher noise level (400 ppm) and a much smaller moon R_m = R_⊕. The distinction between the planet-only (blue) and planet-moon (red) case is not visible by eye in most cases.