Thanks Rainer, good tip, my RA is now running in...and yes you are correct the PE curve avis is arc secs and the guided curve is pixes (1 pixel = 2.75") sorry to confuse.
I am not sure the spikes are seeing related - the reason I sat that is I would expect seeing related excursions to impact both axes equally over time - but there is more "noise" on the RA trace - and it seems to be periodic....
I will see if the run in has any impact on the noise - hope it does, if not I may be in for an Ovision worm I guess...but it a little early for me to make that call.
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