Top panel: upper limit (3σ) of the flux contribution of companions of RS Pup as a function of the angular separation from the Cepheid. The limits obtained using the approaches of Absil et al. (2011) and Gallenne et al. (2015) are shown separately. Bottom panel: map of the χ² of the best binary model fit (left) and statistical significance of the detection (right). No significant source is found in the field of view.