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A two-dimensional sketch of a voxel that includes myelinated axons that are arranged in parallel and have different axonal sizes but a constant g-ratio. The g-ratio is the ratio of the inner (RI) and outer (RO) radii of a myelinated axon. For ensembles of myelinated axons with these properties, the MR g-ratio will be equal to the microscopic ensemble average of g-ratios. This sketch is based on the model of Stikov et al. (2011, 2014a,b).
