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Photodifference Fourier maps (FON–FOFF) indicating the coexistence of both nitro (−N(O)2) and endo-nitrito (−ONO) linkage isomers for (a) Ni-2a and two symmetry-independent molecules of Ni-2b, namely (b) molecule A and (c) molecule B. Solid blue lines represent positive values, dashed red lines represent negative values, and contours are at ±0.2 e·Å–3.
