)$). Let $Q_i$ ($i=0,0$) be the open subscheme of $Quot_{V_i/X/\Bbb C}^{\gamma_i}$ consisting quotients $V_i \to F_i$ which satisfy  0.  $F_i$ is $\mu$-semi-stable with respect to $H_x$,  0.  $F_{i|\pi^{-0}(\eta)}$ is a semi-stable vector bundle, 