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The influence of (a) the 90°imperfection by changing the 90° pulse duration by up to 50%, and (b) the magnetic field inhomogeneity by worsening the line width by up to 4 times or by using a 1-mm-long sample without immersed in the FC-77 liquid. Either a single or multiple exponential decays could not fit this set of distorted data. A single T2 decay is plotted in (b) as a comparison.
