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The timing of TM (before vs after shimming) turned out to be critically important sufficient time is required to achieve full-temperature equilibrium relative to thermal gradients in the air inside the probe and the sample. Achievable accuracy across different NMR solvents varies with differences in thermal conductivity and leads to 2% or greater errors. With matching solvents, the demonstrated accuracy of ∼1.0% underscores the feasibility of EC-qHNMR as a highly practical research tool.The construction of three-dimensional covale