Phase-space plot of a noise-driven
bistable system; the two stable points
are on the left and right, and there is an
unstable point at the center. The system
moves on lines of constant color, with the
black zero-energy lines the most probable.
Noise can cause the system to transit from
one stable point to the other, at a rate
given by the negative exponential of the
area between the black lines.
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