Synthetic exomoon-exoplanet mutual eclipse signals (left column) and their according periodograms (right column). Each row corresponds to a different white noise level, with RMS values ranging from 10 to 100 ppm. The dots in the left column shows the injected signals combined with noise. Different colours represent different exomoon thermal phase curve amplitudes (A), from 2 ppm to 10 ppm. The solid lines in the right column show the corresponding periodograms. Each hypothetical signal has a sampling frequency of 15 minutes and a total observation time of 180 days.