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<tr><td align="left" valign="top" colspan="2"><blockquote><pre style="margin-bottom: -1em;">
Optimisation step length ( Hartree atomic units ).
If <a href="#opt_scheme">opt_scheme</a>=="broyden", ds is used as a guess for the
diagonal part of the Jacobian matrix.
               </pre></blockquote></td></tr>
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