Length measurement system tests: Vertical index offset results in a constant vertical angle error in every measured point.
However, the component along M is indistinguishable from the vertical index offset and is therefore not considered.
There however appears to be reduced or no sensitivity to other geometric misalignment parameters (beam offsets, beam tilt, vertical index offset, vertical encoder eccentricity along Z).
Unlike Keynote's popular public indices, such as the Keynote Business 40 index, neither detailed nor aggregate vertical index data is published on the Keynote Web site.
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