Statistics of Coulomb-blockade peak spacings for a partially open quantum dot

We show that randomness of the electron wave functions in a quantum dot con tributes to the fluctuations of the positions of the conductance peaks. Thi s contribution grows with the conductance of the junctions connecting the d ot to the leads. It becomes comparable with the fluctuations coming from th e randomness of the single-particle spectrum in the dot while the Coulomb-b lockade peaks are still well-defined. In addition, the fluctuations of the peak spacings are correlated with the fluctuations of the conductance peak heights.