  Within the dual superconductor scenario for the QCD confining vacuum, the
chromoelectric field generated by a static $q\overline{q}$ pair can be fitted
by a function derived, by dual analogy, from a simple variational model for the
magnitude of the normalized order parameter of an isolated Abrikosov vortex.
Previous results for the SU(3) vacuum are revisited, but here the transverse
chromoelectric field is measured by means of the connected correlator of two
Polyakov loops and, in order to reduce noise, the smearing procedure is used
instead of cooling. The penetration and coherence lengths of the flux tube are
then extracted from the fit and compared with previous results.
