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Examples of three different forward models. Colors are used to indicate different tissue types.(a) A one sphere brain representation, with the brain surface indicated for completeness. (b) Pink represents the skin shell, white the outer skull shell, and black the inner skull shell. (c,d) Pink and white are used for the skin and the skull, respectively. Gray is used for the whole brain in (c). Gray and white are used for the gray and white matter, and blue is used for the CSF in (d).
