K2-138 light curve and associated models. Top: extracted K2 light curve, using the EVEREST pipeline, of K2-138 with in red the Gaussian process regression trained on the out-of-transit light curve. The positions of transits are marked with coloured lines at the bottom of the top figure. Bottom: light curve after subtraction of the Gaussian process fit. The best six-planet photometric model of the transits is superimposed in red.
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