  We consider the most general asymptotically anti-de Sitter boundary
conditions in three-dimensional Einstein gravity with negative cosmological
constant. The metric contains in total twelve independent functions, six of
which are interpreted as chemical potentials (or non-normalizable fluctuations)
and the other half as canonical boundary charges (or normalizable
fluctuations). Their presence modifies the usual Fefferman-Graham expansion.
The asymptotic symmetry algebra consists of two sl(2)_k current algebras, the
levels of which are given by k=l/(4G_N), where l is the AdS radius and G_N the
three-dimensional Newton constant.
