  A black hole that is ringing down to quiescence emits gravitational radiation
of a very specific nature that can inform us of its mass and angular momentum,
test the no-hair theorem for black holes, and perhaps even give us additional
information about its progenitor system. This paper provides a detailed
description of, and investigation into the behavior of, multimode fitting of
the ring-down signal provided by numerical simulations. We find that there are
at least three well-motivated multimode fitting schemes that can be used. These
methods are tested against a specific numerical simulation to allow for
comparison to prior work.
