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Running OPTIM

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 than 10-5 and the RMS force is also less than 10-5. 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 ยง3.