  We present a chirally symmetric hadronic model for the vector and
axial-vector correlators in vacuum. The dominant contributions to these
correlators come from intermediate pions, rho and a_1 mesons which are
calculated in one-loop approximation. The resulting spectral functions are
compared with the data obtained by the ALEPH collaboration from tau decay. In
the vector channel we find good agreement up to q^2 = 1 GeV^2, in the
transverse axial-vector channel up to q^2 = 2 GeV^2, corresponding to the
regimes dominated by two-pion or three-pion decay channels, respectively. The
longitudinal axial correlator is in almost perfect agreement with the PCAC
result.
