LINDH forces the use of R. Lindh's method^[37] for computing the initial guess of the Hessian matrix. This initial guess is needed for quasi-Newton optimizers (such as TRUSTE), CHN methods, and simulated annealing (ANNEAL, TSANNEAL, MANNEAL, and GANNEAL). If LINDH is not specified, a 2-body model is used by default to compute the initial Hessian matrix. Lindh's method is generally comparable to the 2-body model but may be slightly slower in some cases.

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