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Hi Gary - When I wrote that, I was a long way from the black box so I had to try to remember the value. Today I checked it and I found a run of 159 points gave me an all sky RMS of about 29" not 20" sorry for the off the mark guess. Anyway I am happy with that.
That was with about 15 terms. I could have added more but as you told me too many terms and some will start eating each others lunch and their contributions will be indistiguishable from each other and the whole model would become noisy.
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