Difference in normalized Stokes parameters with respect to the debris disk model shown in Figure 10. We find that the GMT creates a large difference in the linear Stokes parameter Q, which is consistent with its large diattenuation in I-band that we reported on in Anche et al. (2023). The largest change in the U and V Stokes parameters is from the TMT, which we know exhibits the greatest retardance in I-band. The U difference images are symmetric, indicating a rotation of the detected polarization states observed from the disk. All three GSMTs suffer from a considerable degree of crosstalk, which is shown by the V parameter which has zero input signal. This is readily apparent from the large I → V element of the Mueller PRM shown in Figure 8.