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A tessellation of a two-dimensional space of collective variables based on a hypothetical MFEP discretized into 20 images. The cells Bn are drawn in thin solid lines. Two putative transition tubes are shown with boundaries drawn in thick solid and dotted lines (the upper dotted line coincides with the solid line). The area inside the first transition tube (solid lines) is shaded in gray. The numbers correspond to the images and to the associated cells Bn.
