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a Bernard and Hertel grid. b The centre of the AM and PL bundles are shown according to the data of Columbet et al. [16]. In this study, the centre of the AM bundle was found to lie at a point 25 % along Blumensaat’s line (t) and 25 % along line h. The centre of the PL bundle was located at a point 33 % along line t and 50 % along line h
