  Bremke and Xi determined the lowest two-sided cell for affine Weyl groups
with unequal parameters and showed that it consists of at most |W_{0}| left
cells where W_{0} is the associated finite Weyl group. We prove that this bound
is exact. Previously, this was known in the equal parameter case and when the
parameters were coming from a graph automorphism. Our argument uniformly works
for any choice of parameters.
