<!-- BEGIN chart/image.tt -->
    [%
        IF constraint_type; # add constraint type if included in call to image.tt:
            target_url = target_url _ '?constraint_type=' _ constraint_type;
        END;
    %]
    
    <div class="indent">
        <img id="chart" src="[% target_url %]">    
    </div>
    
    <p class="indent">[% site.html.back_button %]</p>
<!-- BEGIN chart/image.tt -->
