Extended Data Fig. 5: Mapping of the streamlines on a topographic map.

(a) Configuration of our model (see Fig. 2b). (b) Rules for the topographic map. If the edge is gray, If there is no arrow, the two faces have the same height. If there is an arrow pointing to the right, when moving from f to \({f}^{{\,\prime} }\), then \({h}_{{f}^{{\prime} }}={h}_{f}-1\). If there is an arrow to the left, then \({h}_{{f}^{{\prime} }}={h}_{f}+1\). (c) Topographic map corresponding to (a). In this configuration, \(\Delta h=\max h-\min h=2\).