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¶þÉóÒâ¼û 1. It is still not evident that the obtained rotation matrix based on the proposed approach always maintains orthogonality, especially when input observables are disturbed by random errors. I do not find any derivations/discussions addressing this issue.

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it would be good if  authors can illustrate that the rotation matrix R in Eq.(3) is orthogonal when input observables are perturbed by random errors.
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