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    <div class="moz-cite-prefix">Dear Oleg and Phil,</div>
    <div class="moz-cite-prefix"><br>
    </div>
    <div class="moz-cite-prefix">thanks a lot! <br>
    </div>
    <div class="moz-cite-prefix">Best regards,</div>
    <div class="moz-cite-prefix">Guenter<br>
    </div>
    <blockquote type="cite"
cite="mid:CADd3otFxiX1ePQBg6tuL-9y3au1xwG63yij3sr675BUbOPRUhw@mail.gmail.com">
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      <div dir="ltr">Dear Guenter,
        <div><br>
        </div>
        <div>Yes, it is similar to adding bond/angle restraints
          described here:</div>
        <div><a
href="https://phenix-online.org/documentation/reference/refinement.html#definition-of-custom-bonds-and-angles"
            moz-do-not-send="true" class="moz-txt-link-freetext">https://phenix-online.org/documentation/reference/refinement.html#definition-of-custom-bonds-and-angles</a><br>
        </div>
        <div>The only difference is you would use planarity restraints
          scope as below (from the bottom of the doc page):</div>
        <div>
          <ul
style="list-style:none;color:rgb(0,0,0);font-family:monospace;font-size:11.7px">
            <li class="gmail-phil-param gmail-phil-scope"
              style="clear:both;padding:5px"><span
                class="gmail-phil-name" style="font-weight:bold">planarity</span>
              <ul style="list-style:none">
                <li class="gmail-phil-param"
                  style="clear:both;padding:5px"><span
                    class="gmail-phil-name">action</span><span
                    class="gmail-phil-words" style="color:red"> = *add
                    delete change</span></li>
                <li class="gmail-phil-param"
                  style="clear:both;padding:5px"><span
                    class="gmail-phil-name">atom_selection</span><span
                    class="gmail-phil-words" style="color:red"> = None</span></li>
                <li class="gmail-phil-param"
                  style="clear:both;padding:5px"><span
                    class="gmail-phil-name">sigma</span><span
                    class="gmail-phil-words" style="color:red"> = None</span></li>
              </ul>
            </li>
          </ul>
          You will have to combine all atoms you want to a single
          selection, like "Chain X and resid Z and (name A or name B or
          name C or name D)", where Z is residue id (a number).</div>
        <div><br>
        </div>
        <div>Best regards,</div>
        <div>Oleg Sobolev.</div>
      </div>
      <br>
      <div class="gmail_quote">
        <div dir="ltr" class="gmail_attr">On Fri, May 27, 2022 at 4:48
          AM Guenter Fritz &lt;<a
            href="mailto:guenter.fritz.phenix.ccp4@gmail.com"
            moz-do-not-send="true" class="moz-txt-link-freetext">guenter.fritz.phenix.ccp4@gmail.com</a>&gt;
          wrote:<br>
        </div>
        <blockquote class="gmail_quote" style="margin:0px 0px 0px
          0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Dear
          all,<br>
          <br>
          is it possible to define custom planar restraints, let's say
          atoms  <br>
          A,B,C,D from residue Z should stay in a plane.<br>
          <br>
          Best regards,<br>
          <br>
          Guenter<br>
          <br>
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