RhoCandList XibarXiSystem;
XibarXiSystem.Combine(aXiplusFitList, XiminusFitList);
for ( int i_sys = 0; i_sys < XibarXiSystem.GetLength(); i_sys++ ) {
    curCand = XibarXiSystem[i_sys];
    Pnd4CFitter fit4C(curCand, ini);
    fit4C.Fit();
    ...
}