Difference in o- and e-beam position, xdiff = xO − xE (top) and ydiff = yO − yE (bottom), for matched stars of ordinary and extraordinary beams as a function of o beam xO (left) and yO (right) location in the combined image. The results correspond to 583 stars of a M 30 I-band image at θHWP = 22.5°. The best quadratic fit for ydiff vs y is shown in orange.
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