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Power spectra of the O5′⋯O4′ distance autocorrelation function and the O5′⋯O4′ and H257:Nδ⋯O5′ distance-distance cross-correlation functions of guanosine and 
complexed with hPNP and E:R hPNP (a). The plots show the distance O5′⋯O4′, H257:Nδ⋯O5′, and the summation of two distances throughout the last 100 ps of a 260 ps simulation (b).
