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\DM^{n+1}_{\mathrm{in}} = \DM^n_{\mathrm{in}} + w \Res[n].
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\begin{fdfentry}{SCF.Mixer!History}[integer]<2>%
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\fdfindex*{DM.NumberPulay}[|see SCF.Mixer.History]%
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\fdfindex*{DM.NumberBroyden}[|see SCF.Mixer.History]
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Number of previous SCF steps used in estimating the following input.
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Increasing this number, typically, increases stability and a number
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of around 6 or above may be advised.