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. 2016 Jul 29;6:30369. doi: 10.1038/srep30369

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Copyright © 2016, The Author(s)

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(a) The bi-dimensional plot of the reduced density gradient s versus sign(λ₂)ρ with the H-bond region indicated. (b) Gradient isosurfaces (s = 0.2 a.u) colored on a RGB scale according to the sign(λ₂)ρ values over the range of −0.03 to 0.03 a.u.