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. 2017 Jun 22;73(Pt 7):600–608. doi: 10.1107/S2059798317007707

Figure 1.

Figure 1

Peak frequencies which can be produced by noise in the m|F o| − D|F c| maps from experimental and modelling errors. (a) Peak frequencies around P, C1′ and O6/N6/O4/N4 atoms (the sixth heteroatom in purine and the fourth heteroatom in pyrimidine) are shown at thresholds of 3.5, 3 or 2.5σ. Simulations were carried out with FoFc error or sigmaF error. The bar indicates standard deviation within all residues. (b) Peak frequencies of P atoms in the simulation with FoFc error. Atoms without alternative locations were used to draw the figures.