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This means the overlap is 3 times larger on the left and right border of each LAM grid than at the top and bottom! This is done because the solver needs the grids to be 3 times larger in x- than in y-direction (minus 1 point).
Example for a 0.25°
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Yin-Yang grid
1. First calculate the size of the overlap when covering 8 times the grid resolution:
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