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Any number of optimisation steps can be run with a
single call to OPTIM, as specified by the keyword STEPS.
The default convergence criteria for eigenvector-following and steepest-descent runs are
that the maximum unscaled step size for
any coordinate (or eigenvector, depending upon the scaling criterion) is less
and the RMS force is also less than
The number of negative Hessian eigenvalues must also agree with the search type requested.
These convergence criteria can be overruled by the
CONVERGE keyword, as described in §3.