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Examples illustrating local refinement. (a) In this example, the vector around REl on the column marked Ci+3 is compared to vectors on adjacent columns within range to find the best match for the refinement. Note that the vector is smaller than in practice and for simplicity, only columns in a plane are shown. (b) Illustration of BFS to find neighboring columns whose costs need to be adapted. Note that in this case, comparisons are based on column Ci.
