  We study a quantum XX chain coupled to two heat reservoirs that act on
multiple-sites and are kept at different temperatures and chemical potentials.
The baths are described by Lindblad dissipators which are constructed by direct
coupling to the fermionic normal modes of the chain. Using a perturbative
method, we are able to find analytical formulas for all steady-state properties
of the system. We compute both the particle/magnetization current and the
energy current, both of which are found to have the structure of Landauer's
formula. We also obtain exact formulas for the Onsager coefficients. All
properties are found to differ substantially from those of a single-site bath.
In particular, we find a strong dependence on the intensity of the bath
couplings. In the weak coupling regime, we show that the Onsager reciprocal
relations are satisfied.
