  We perform a global fit to the inclusive structure function considering a QCD
inspired model describing the ep scattering. In lines of a two Pomeron
approach, the structure function F_2 has a hard piece given by the model and
the remaining soft contributions: the soft Pomeron and non-singlet content. We
have investigated several choices for the soft Pomeron and its implication in
the data description. In particular, we carefully estimated the relative role
of the hard and the soft contributions in a large span of x and Q^2.
