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<div>Hello,</div><div><br></div><div>I assume that you mean pull_pbcatom0...</div><div><br></div><div>Nothing changes when I set this to an atom index I am afraid.</div><div><br></div><div>I saw that you had use pull_geometry=cylinder in your recent JACS paper.</div><div><br></div><div>Would it be too much to ask to see those pull settings?</div><div><br></div><div>I simply cannot get the molecule to stay at the desired z-position...</div><div><br></div><div>Thanks!</div><div><br></div><div><br></div><div><br>> Hi,<br>> <br>> we had similar trouble some time ago, and we could solve it by using a <br>> good PBC atom. Make sure that your pbc_atom is in the very center of <br>> your membrane.<br>> <br>> Btw, using "distance" to compare with "cylinder" is a bad test, since it <br>> does something very different (the distance is the same at z=com-1 and <br>> z=com+1. I would use "direction" or "position" for your test. You can <br>> also use position/direction for the umbrella simulations, you'll <br>> probably get similar results to the geometry "cylinder", but you'll also <br>> have to make sure your pbc_atom is fine.<br>> <br>> Cheers,<br>> Jochen<br></div>                                            </div></body>
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