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Patrick Wallace analyzed my models (on the Software Bisque forum) an came to the conclusion that either model should work equally well. That wasn't my experience but perhaps I was too hasty in giving up on the smaller model. The apparent change in the ME term comparing the 2 models is due to additional terms (HXSH and HDCH) being added to the model. These terms are quite similar to the ME term. His analysis also shows that I have about 4 arc-sec of hysteresis somewhere in the system (telescope + mount) but still achieve 7 arc-sec pointing accuracy.
Peter
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