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The DrizzlePac Handbook > Appendix A: Plate Scales and Polynomial Distortions > A.4 Velocity Aberration for ACS

The effects of velocity aberration can cause a difference of order one pixel across the diagonal of the ACS Wide Field Camera (ACS/WFC) with its 4096 x 4096 pixel field of view. The isotropic nature of these changes can be seen in Figure A.3.