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Firing fields of a grid cell recorded in two enclosures, a rectangle (above) and a left trapezoid (below). The north and east walls of the two boxes have the same dimensions but a corner has been shaved off the rectangle to create the trapezoid. The displacement of the left wall has affected the grid fields close to that wall but has had little effect on those on the right side of the enclosure. The field in the trapezoid has a perfect triangular grid structure as shown by the overlaid gray triangles while the shift of the left wall moves several fields (see white arrows) and distorts the grid.

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