  The equilibrium of a finite-beta cylindrical RFP plasma in the presence of
saturated-amplitude tearing modes is investigated. The singularities arising
from the perturbative analysis of the MHD force balance equation JxB=grad(p)
are resolved through a proper regularization of the cylindrical symmetric
component of the pressure and parallel current density profiles, by setting to
zero their gradient at the modes rational surfaces. An equilibrium model, which
satisfies the regularization rule at the various rational surfaces, is
developed. The comparison with the experimental data from the Reversed Field
eXperiment (RFX) gives encouraging results. The model provides an easy tool to
extrapolate the magnetic data, ordinarily measured only at the plasma edge,
inside the plasma. As an application, we present the computation of the
particle and heat stochastic diffusion coefficient from the reconstructed
magnetic field profile.
