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Hi , I was using MRI Convert to convert my DICOMs in to NIFI files when I got these warning message: 1. "Polarity of the bvecs may be wrong for vb15 data" 2. "bvecs are sometimes wrong for vb13 data, due to a bug in the algorithm by which Siemen's converted the B_matrix to a principle eigendirection. use with caution" Kindly, What is the meaning of each of the previous messages?