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== Features ==
SIESTA has these main characteristics
* It uses the standard Kohn-Sham selfconsistent [[Density functional theory|density functiona]]<nowiki/>l method in the [[Local-density approximation|local density]] (LDA-LSD) and generalized gradient (GGA) approximations, as well as in a non local functional that includes [[van der Waals interactions]] (VDW-DF).
* It uses norm-conserving [[pseudopotential]]s in their fully nonlocal (Kleinman-Bylander) form.
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