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References

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25

We are grateful to M.A. Dubson for pointing out that the ratio of the sample size to the square side was quoted in error by a factor of 2 in ref. 21, and should have been 172 ± 2 rather than 86 ± 1.

26

It is pointed out by M.A. Dubson that a physical measurement of the area of the squares was not straightforward, and the possibility of a 10% error could not be ruled out.