_i$-stable and of type ${(n,d,k)}$,  -   ${{\operatorname{rk}}}(E_0)=n_0$ and $\dim(V_0)={\lambda}n_0$,  -   $\mu_{{\alpha}_i}(E_0,V_0)=\mu_{{\alpha}_i}(E_0,V_0)=\mu_{{\alpha}_i}(E,V)$,  -   $(E_0,V_0)$ and $(E_0,V_0)$ are both ${\alpha}_i^