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* Comparing results obtained at different magnetic fields should, in the case of perfect consistency and assuming the absence of conformational exchange, yield equal values independently of the magnetic field.
* avoid the potential extraction of erroneous information as well as the waste of time associated to dissecting inconsistent datasets using numerous long model-free minimisations with different subsets of data.
* The authors prefer the use of the spectral density at zero frequency J(0) alone since it '''does not rely''' on an estimation of the global correlation time '''tc/tm''', neither on a measure of theta, the angle between the 15N–1H vector and the principal axis of the 15N chemical shift tensor. Hence, J(0) is less likely to be affected by incorrect parameterisation of input parameters.
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