Thank you for following up on this. This looks very promising. I do recall a discussion on CloudyNights (CN) where they considered using the DEC guiding value as an indication of 'seeing.' Their reasoning was that if you had a decent polar alignment then there should be no DEC corrections other than whatever was due to star motion from seeing. So if you subtracted any drift in DEC then the resultant DEC rms motion should be also correlated with seeing. I have not more information than this, but I will try to fine the reference from CN.

thanks,
Ron

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