  The contribution to precision electroweak measurements due to TeV physics
which couples primarily to the $W^\pm$ and $Z$ bosons may be parameterized in
terms of the three `oblique correction' parameters, S, T and U. We extend this
parameterization to physics at much lower energies, $\ge 100$ GeV, and show
that in this more general case three more parameters are required (which we
call V, W and X). Only two of these appear in neutral-current experiments,
while the third new parameter enters into the $W^\pm$ width.
