  Let $A$ be an abelian variety over a discretely valued field. Edixhoven has
defined a filtration on the special fiber of the N\'eron model of $A$ that
measures the behaviour of the N\'eron model under tame base change. We
interpret the jumps in this filtration in terms of lattices of logarithmic
differential forms in the case where $A$ is the Jacobian of a curve $C$, and we
give a compact explicit formula for the jumps in terms of the combinatorial
reduction data of $C$.
