Conceptual drawing illustrating the principle of dOTF. Left panel: depiction of a generic pupil with a single pupil modification near the bottom edge, along with a conceptual drawing of the dOTF contents and its location relative to the introduced pupil modification. Middle panel: similar to the depiction in the left panel, but with two pupil modifications present at the edge of the pupil. Right panel: similar to the depiction in the left panel, but with three pupil modifications at the edge of the pupil. The red circle represents the reflected and conjugated part of the pupil field image identified with the blue circle. The colors of the various pupil modifications are arbitrary and used for illustrative purposes only.