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Finally, success!
I redid the model and now have a 480 point model that is essentially the same as the previous model but contains additional data points further to the north and south. This has changed the altitude recommendation of T-Point from a previous within .1 tic of refracted pole to 1.1 tics from refracted pole. I didn't move the mount but assume that T-Point just uses that difference to adjust how it moves/points with Protrack. The result now is about as good as I can imagine. Why the earlier model does not capture the altitude is not clear. The one anomaly is the 5 min TEC140 image showing a larger aspect change than any of the other images. Perhaps this means the TEC140 is moving relative the TEC180. But, the following 7 min image is very good.
Peter
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