Fig. 4.7.

Plot of absolute values of approximate errors in probabilities over the 60 × 60 grid of cells used to approximate the solution to the inverse problem. The errors are approximated using a more accurate approximation F̃⁽²⁾(t) computed using a refined numerical solution with a time step of 10⁻², resulting in E < 10⁻⁷, and 10⁸ samples of the output density to make statistical errors small. The maximum in this plot is approximately 6.70 × 10⁻⁰³, which is less than the computed bound 2.55 × 10⁻⁰².