For positive values of NDIMIN, the number of sites in the cluster around each site is determined as the total number of orbitals in the cluster > NDIMIN. The number of orbitals on each site is weighted by WSR(tail)/WSR(head). I. e. NDIMIN < Sum(i) (number of orbitals at site i) s(i)/s(j) for the cluster around site j. This is not done if NDIMIN=0. The default value is 350.