Real (left) and imaginary (right) parts of the measured planet-to-star coherent flux ratio, ℱ, on the six UT baselines, during one 10 s frame. The error range is plotted in the background. The thick lines show the best-fit model as described in Sect. 4.1. It includes the star–planet modulation, the stellar speckle contamination (dashed blue curves), and the planet-to-star contrast assumption (dashed black curve).