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PEMPro plot of raw data showing periodic error of my Losmandy G-11 Mount.
Peaks and valleys are not aligned due to 76s harmonic resulting from the bearings.
PEMPro plot of raw data after bearings were replaced and bearing blocks machined to a rounder bore.
Note that peaks and valleys line up well in this plot.
PEMPro plot of raw data with PEC enabled. Notice that amplitude is less than +/- 5"
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Created: 23 May 2006