  The relationship between experimental observables for Lorentz violation in
the fermion sector and the coefficients for Lorentz violation appearing in the
lagrangian density is investigated in the minimal Standard-Model Extension. The
definitions of the 44 fermion-sector observables, called the tilde
coefficients, are shown to have a block structure. The c coefficients decouple
from all the others, have six subspaces of dimension 1, and one of dimension 3.
The remaining tilde coefficients form eight blocks, one of dimension 6, one of
dimension 2, three of dimension 5, and three of dimension 4. By inverting these
definitions, thirteen limits on the electron-sector tilde coefficients are
deduced.
