<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Hi Yazan,<div class="">If you show consecutive alpha-carbons (but not the other backbone atoms) they are automatically connected by lines. You don’t have to do anything else. For example:</div><div class=""><br class=""></div><div class="">open 121p</div><div class="">hide cartoon</div><div class="">show @ca</div><div class="">hide @n,c,o</div><div class=""><br class=""></div><div class="">See image attached below for the result. Tested in ChimeraX 0.9 release.</div><div class=""><br class=""></div><div class="">The CA-CA lines are actually pseudobond sticks but thinner than the “real” bond sticks. You can make them fatter if you want. In this example, if you look in the Models panel, this pseudobond model is #1.2 chain trace. Here is an example command to make them fatter:</div><div class=""><br class=""></div><div class="">size #1.2 pseudobondradius .2</div><div class=""><br class=""></div><div class=""><<a href="http://rbvi.ucsf.edu/chimerax/docs/user/commands/size.html" class="">http://rbvi.ucsf.edu/chimerax/docs/user/commands/size.html</a>></div><div class=""><br class=""></div><div class="">I hope this helps,</div><div class="">Elaine<br class=""><div class="">-----<br class="">Elaine C. Meng, Ph.D.<br class="">UCSF Chimera(X) team<br class="">Department of Pharmaceutical Chemistry<br class="">University of California, San Francisco<br class=""></div><br class=""><blockquote type="cite" class="">On Aug 21, 2019, at 7:39 AM, Yazan Abbas <<a href="mailto:yazan.abbas@gmail.com" class="">yazan.abbas@gmail.com</a>> wrote:<br class=""><br class="">Hi, <br class="">While looking through the user guide, I came across an option to draw a line between consecutive Calphas that are displayed. I made a mental note to use that option in my figure, but I failed to bookmark it or write down what the command was. I've been through the user guide several times again, but can't seem to find it. Would appreciate it if someone could jog my memory.<br class="">Thanks, <br class="">Yazan<br class=""></blockquote><br class=""></div><div class=""><img apple-inline="yes" id="BE752B9A-FD82-4BFA-9922-DC869516B0EC" src="cid:2CFAAE9F-D95F-4DED-BB86-74E91F729A69" class=""></div></body></html>