<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Can anyone provide some help.<div><br></div><div>I'm trying to select two specific oxygen atoms in different residues (98 and 142).</div><div><br></div><div>The command <b>select :142@O1 :98@O1</b> selects only 1 atom (that of residue 142).</div><div><br></div><div>I tried <b>select :98@O1</b> only. The output is <b>"selection" cleared</b>.</div><div><br></div><div>I'm rather puzzled. Any help would be greatly appreciated</div><div><br></div><div>Regards</div><div><br></div><div>George</div></body></html>