  We demonstrate that the results of the complete first order calculation of
the non-factorizable QED corrections to the single-inclusive cross-sections for
$e^+e^- \to W^+W^- \to 4$ fermions could be very well reproduced by a simple
physically motivated ansatz. The latter allows to take into account effectively
the screening role of the non-Coulomb radiative mechanisms by introducing a
dampening factor in front of the width-dependent part of the known first-order
Coulomb correction, the so-called screened-Coulomb ansatz.
