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J,
as Bojan says, K3 is a great bit of software. The drift feature is
probably duplicated in other similar packages but being familiar with
K3 I can thoroughly recommend it.
You can export the graph into Excel and draw your Periodic Error.
A picture is much more easy to interpret once it's in a graph form.
For refining polar alignment in a permanent setup I couldn't talk
highly enough of it.
Well worth the price.
Steve
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