function collectedHist = attachToDom(obj, dom, parent, collectedHist)
  
  collectedHist = attachToDom@ltpda_nuo(obj, dom, parent, collectedHist);
  
  % Add yunits
  if isa(obj.yunits, 'unit')
    yunitsNode = dom.createElement('yunits');
    collectedHist = obj.yunits.attachToDom(dom, yunitsNode, collectedHist);
    parent.appendChild(yunitsNode);
  end
  
  % Add y
  yNode = dom.createElement('y');
  utils.xml.attachNumberToDom(obj.y, dom, yNode)
  parent.appendChild(yNode);
  
  % Add dy
  dyNode = dom.createElement('dy');
  utils.xml.attachNumberToDom(obj.dy, dom, dyNode)
  parent.appendChild(dyNode);
  
end