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. Author manuscript; available in PMC: 2014 Jul 6.
Published in final edited form as: J Am Chem Soc. 2011 Jan 5;133(5):1534–1544. doi: 10.1021/ja108943n

Figure 7.

Figure 7

Contour plots of intramolecular 13C–15N distances as a function of (χ1, χ2) torsion angles. Only contour lines matching the measured distance values are shown. (a,b) Measured Cα–Nδ1 (red) and Cα–Nε2 (black) distances for cationic imidazolium at pH 4.5 (a) and neutral τ tautomer at pH 8.5 (b). (c,d) Measured Cδ2–Nα (red) and Cε1–Nα (black) distances in cationic histidine (c) and neutral τ tautomer (d). Best-fit torsion angles were read from the positions where the contours overlap.