code: @Override
  	public String drawAxes() {
  		StringBuilder s = new StringBuilder();
  //		Point3d centroid = helixAxisAligner.getCentroid();
  //		System.out.println("Centroid: " + helixAxisAligner.getCentroid());
  //		Point3d centroid = helixAxisAligner.getGeometricCenter();
  		Point3d centroid = helixAxisAligner.calcCenterOfRotation();
  //		System.out.println("Geometric center: " + centroid);
  		AxisAngle4d axisAngle = helixAxisAligner.getHelixLayers().getByLowestAngle().getAxisAngle();
  		Vector3d axis = new Vector3d(axisAngle.x, axisAngle.y, axisAngle.z);
  
  		s.append("draw axesHelical");
  		s.append(name);
  		s.append(0);
  		s.append(" ");
  		s.append("line");
  		Point3d v1 = new Point3d(axis);
  		v1.scale(AXIS_SCALE_FACTOR*(helixAxisAligner.getDimension().y + SIDE_CHAIN_EXTENSION));
  		Point3d v2 = new Point3d(v1);
  		v2.negate();
  		v1.add(centroid);
  		v2.add(centroid);
  		s.append(getJmolPoint(v1));
  		s.append(getJmolPoint(v2));
  		s.append("width 1.0 ");
  		s.append(" color red");
  		s.append(" off;");
  		return s.toString();
  	}
docs: Returns a Jmol script that draws symmetry or inertia axes for a structure.
  Use showAxes() and hideAxes() to toggle visibility.
  @return Jmol script