.  For any $\Lambda \in {{\mathcal B}}^0_{{{\mathbb{Z}}}^d}$ let us consider a configuration $\sigma$ such that $D_\sigma \subseteq \Lambda$ and $\sigma(x)=i$ for every $x \in {{\mathbb{Z}}}^d$ lying in the unique infinite connected component of ${{\mathbb{Z}}}^d - D_\sigma$. If $\Gamma_{\sigma}$ denotes the family of contours associated to $\sigma$, then we have $$\label{