public void render(Graphics g) {
   super.render(g);
   g.setColor(defaultColor);
   for (Vector2D v : outliers)
     g.drawOval((int) (v.x - radius / 2), (int) (v.y - radius / 2), radius, radius);
 }
 public void clearPoints() {
   super.clearPoints();
   outliers.clear();
 }