the different economic sectors, red for technology, blue for energy and green for financial. The thickness of links is proportional to the bootstrap percentage and this value is the number close to each link.[]{data-label="mst10"}](MST_ult_no_lab){width="100.00000%"}

By replacing eq. (\[singleadjust\]) with $$\label{averageadjust}
\left\{
\begin{aligned}
& q_{ij}=q_{hk}, \text{ if } i\in S_h \text{ and } j\in S_k \\
& q_{ij}=\text{{\bf Mean}}  \left\{ q_{pt}, p\in S \text{ and } t\in S_j, \text{ with } S_j\neq S \right \}, \\
& ~~~~~~~  \text{ if } i\in S \text{ and } j\in S_j \\
& q_{ij}=q_{ij}, \text{ otherwise};
\end{aligned}
\right.$$ in the step (v) of the above procedure one obtains an algorithm performing the ALCA and the final ${\bf Q}$ of the procedure is the correspondent correlation matrix. The obtained tree $g$ that we termed ALMST (Tumminello et al., 2007c) is a tree naturally associated with such a clustering procedure. The choice of the link at step (iii) of the ALMST construction algorithm does not affect the clustering procedure but specify the construction of the correlation based tree. More precisely by selecting any link between nodes $u \in S_h \text{ and } p \in S_k $ the matrix ${\bf Q}$ representing the result of ALCA remains 