Step potentials for Dark Energy
  We consider a reconstructing scheme using observational data from SNIa, BAO
and CMB, based on a model of dark unification using a single non-minimally
coupled scalar field. We investigate through a reconstruction program, the main
features the current observational data imposes to the scalar field potential.
We found that the form suggested by observations implies a step feature in the
potential, where the kinetic and potential energy becomes of the same order of
magnitude.
