Figure 2: A 7 x 7 neighbourhood of a cell illustrates the raster to graph conversion. The arrows mark the links between the cell in the centre and its neighbours. The red arrows indicate links via Queen's moves, the pale orange arrows represent Knight's moves, and for the blue arrows the terms A- and B-moves are used throughout this article. Red dots indicate cells that can be reached by straight-line connections with Queen's moves, pale orange dots are targets of Knight's moves, and the blue dots mark cells that are targets of A- or B-moves. Image credit: I. Herzog.
Figure 2

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