  The dual superconductivity of the vacuum in SU(3) gauge theory is
investigated by constructing a disorder parameter which signals monopole
condensation in various abelian projections and by studying numerically on the
lattice its behaviour at finite temperature. We find that the vacuum is a dual
superconductor with respect to each U(1) of the residual gauge group after
abelian projection independently of the abelian projection chosen. Like in the
SU(2) case (discussed in a companion paper) a finite size scaling analysis
enables us to extract the indices of the phase transition and our analysis is
consistent with independent determinations.
