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+u/distortion: Improve both Vive and Index distortion by fixing polynomial math.
diff --git a/doc/changes/auxiliary/mr.667.md b/doc/changes/auxiliary/mr.667.md
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+u/distortion: Improve Index distortion and tidy code. While this touches the
+Vive distortion code all Vive headsets seems to have the center set to the same
+for each channel so doesn't help them. And Vive doesn't have the extra
+coefficient that the Index does so no help there either.