try new representation

lib/imp.html

@@ -72,7 +72,7 @@
             <div role="tabpanel" class="tab-pane fade" id="raw">
               <section id="raw-section" class="row">
                 <h2><small>Raw data statistics</small></h2>
-                <div class="btn-group" data-toggle="buttons">
+                <div id="but-raw" class="btn-group" data-toggle="buttons">
                     <label class="btn btn-primary active">
                         <input id="but-raw-r1" type="radio" class="btn btn-default" checked>R1
                     </label>