<div dir="auto">It is just an initial guess, maybe related to some test calculation of silicon done 30 years ago that everyone has forgotten. You can try to change it, but it won't make much difference if you don't go wild (in which case, it usually gets worst)<div dir="auto"><br></div><div dir="auto">Cheers<br><br><div data-smartmail="gmail_signature" dir="auto">-- <br>Lorenzo Paulatto</div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, 23 Feb 2021, 22:50 Andrew Xu, <<a href="mailto:andrewaccount@gmail.com">andrewaccount@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Hi users,</div><div><br></div><div>The preconditioner in LR_modules/h_prec.f90 is given in terms of the quantity eprec, which is 1.35 times the expectation value of the kinetic energy. Where does the 1.35 come from?</div><div><br></div><div>I saw that this question was asked a number of years ago in the developers' mailing list (<a href="https://lists.quantum-espresso.org/pipermail/developers/2013-May/000505.html" target="_blank" rel="noreferrer">https://lists.quantum-espresso.org/pipermail/developers/2013-May/000505.html</a>), but there was no answer there.</div><div><br></div><div>Best,</div><div>Andrew<br></div></div>
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