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In terms of % of the initial spin, how much of the spin do you think wears off during the ball flight? More specifically: assume your opponent performs a spinny loop, the ball bounces off your side of the table and soon thereafter the "useful" part of its trajectory starts (i.e. the part where you can hit it back on the table in whatever fashion, be it counter loop, block or chop). This is also the point where it makes sense to measure the initial spin. The last point of the useful trajectory is somewhere low and far off the table where you'd have to go for a Xu Xin style shot. And this is the point where the ball is spinning the slowest. So the question is: how much slower? Guesstimates or links to actual research, which I doubt there is, are all welcome.
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