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As ``Number of branches on last level'' you specify the number of branches
on the last level. A branch is a
cluster of atom groups (units), which is structured into smaller sub-clusters
on finer levels. The number of branches on the last level must be a multiple
of the number of nodes.
A negative number indicates, that EGO determines the number of branches on
the last level automatically at run time.
The utility program xpl2lis enters a negative number
for the optimal number of branches, thus, no manual changes are necessary.