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. 2011 Jun 27;108(29):11794-11798. doi: 10.1073/pnas.1108073108

Fig. 2.

Fig. 2.

Correlation of the average number of HB/molecule with ΔU0. We define an HB to exist only when the inter-oxygen distance is less than 3.5 Å and simultaneously the O-H….O angle is less than 30° (34). Statistics are collected by scanning the 50-ns NPT trajectory every 5 ps.