<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi,<div><br></div><div>The centroid feature is great, but I would like to select two centroids of a centroid and an atom and then measure the distance between them. When I try this I get the Error Message: "Exactly two atoms must be selected in the graphics window". Is there anyway to add the ability to make these measurements.</div><div><br></div><div>Thanks,</div><div>Dave<br><div> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>--------------------------------------------------------<br>David Chenoweth<br>NIH Postdoctoral Fellow<br>Swager Research Group<br>Massachusetts Institute of Technology<br>Chemistry Department, 18-053<br>77 Massachusetts Avenue<br>Cambridge, MA 02139<br><br>Email: <a href="mailto:dcheno@mit.edu">dcheno@mit.edu</a><br>Lab Phone: 617-258-6537<br>--------------------------------------------------------</div><div><br></div></div></span><br class="Apple-interchange-newline"> </div><br></div></body></html>