    <a href="../charts/polar.html">
            
                    
                    Polar Area
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.6" data-path="../charts/bubble.html">
            
                <a href="../charts/bubble.html">
            
                    
                    Bubble
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.