Columns represent from and rows represent to. Migration models determine the structure of the matrix. The migration multiplier changes the elements in the matrix by this factor (direct multiplication). To enter arbitrary elements in the matrix choose the "user" migration model. Spatial arrangements (twoD, twoDwDiagonal, and distance) require that the populations be arranged in rows and columns. The product of the rows and columns must equal the number of populations. In addition, twoD and twoDwDiagonal have to have both rows and columns > 1.
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