<div dir="ltr">Does anybody know how Molpro calculates mixed derivatives using central differences? It seems like it generates only two mixed displacements instead of four, so the general formula cannot be applied directly. <br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr">Kind regards, Aleksandr O. Lykhin.<br></div></div></div></div>
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