Extended Grid

A region covered by a core grid and its ghost regions. The dimensions of the q array in the NodeInfo structure will cover the grid's extended region, and typically represent the dimensions of the core grid, plus 2 * Info%r * Info%mbc on each side, where Info%r is the refinement ratio for the level, and Info%mbc is the number of cells by which the core grid should be extended past the boundary (thus, a 1D core grid would be extended to the left by r * mbc cells, and to the right by r * mbc cells).