  We present an alternative functional renormalization group (fRG) approach to
the single-impurity Anderson model at finite temperatures. Starting with the
exact self-energy and interaction vertex of a small system ('core') containing
a correlated site, we switch on the hybridization with a non-interacting bath
in the fRG-flow and calculate spectra of the correlated site. Different
truncations of the RG-flow-equations and choices of the core are compared and
discussed. Furthermore we calculate the linear conductance and the magnetic
susceptibility as functions of temperature and interaction strength. The
signatures of Kondo physics arising in the flow are compared with numerical
renormalization group results.
