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I don't think AAO site is a good measure of general seeing - its a notoriously poor site for seeing conditions not being very high and surrounded by many km of hilly country in all directions , so a figure of 2 arc second might be pessimistic for the rest of the country .
If its any value I remember that the prototype stellar interferometer set by Sydney Uni at Lindfield CSIRO found the average size of the air cells deduced by stellar interferometry to be around 150mm at that site . I'm not sure how directly that translates to equivalent seeing but I always found it interesting .
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