Example of reference pixel selection for one assumed planet position. The signal here is assumed to move through the position (Δx, Δy) ≈ (0, 28) pixel above the star at the midpoint of the observation sequence. This position is marked by a pink cross and represents the center of the reduction area, . The reference pixels, , are shown in white. This example is based on the 51 Eri observation’s parallactic angles, the annulus is seven pixels wide.