Examples of median frames after derotation, with 10⁻¹ amplitude fake companions, using subsets of frames corresponding to those used in reductions of strips 0 (left) and strips 1 (right). These are the same as ADI frames, but without subtraction of the host star (and without imposing a tesselation pattern). The PCA-based reconstruction of the host star PSF reproduces in the companion PSF the same tip, tilt, phase (modulo 2π), and fringe visibility in every subsidiary frame. In these ADI frames, the fringes have different amounts of visibility, which can happen due to phase diversity among the subsidiary frames or different amounts of on-sky rotation.