  Let K be a local field whose residue field is a finite field of
characteristic p, and let L/K be a finite totally ramified Galois extension.
Fried and Heiermann defined the "indices of inseparability" of L/K, a
refinement of the ramification data of L/K. We give a method for computing the
indices of inseparability of the extension L/K in terms of the norm group
N_{L/K}(L^*) in the case where K has characteristic p and Gal(L/K) is an
elementary abelian p-group with a single ramification break. In some cases our
methods lead to simple formulas for the indices of inseparability.
