code: public static double getRmsdAtOrigin(Point3d[] fixed, Point3d[] moved) {
  		superposer.setCentered(true);
  		return superposer.getRmsd(fixed, moved);
  	}
docs: Use the {@link SuperPosition#getRmsd(Point3d[], Point3d[])} method of the
  default static SuperPosition algorithm contained in this Class, assuming
  that the point arrays are centered at the origin.