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. 2015 Oct 1;10(10):e0139420. doi: 10.1371/journal.pone.0139420

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© 2015 Ouyang et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 6 — (a) The return-volatility correlation function for the HSI index in Hong Kong and the German DAX index, and that for the fast mode of each index. (b) The return-volatility correlation function averaged over the chosen 40 stocks for the NYSE market, and that of the fast mode.