  We study the wave transport through a disordered system inside a waveguide.
The expectation value of the complex reflection and transmission coefficients
(the coherent fields) as well as the transmittance and reflectance are obtained
numerically. The numerical results show that the averages of the coherent
fields are only relevant for direct processes, while the transmittance and
reflectance are mainly dominated by the diffuse intensities, which come from
the statistical fluctuations of the fields.
