try new representation

lib/imp.html

@@ -72,12 +72,12 @@
             <div role="tabpanel" class="tab-pane fade" id="raw">
               <section id="raw-section" class="row">
                 <h2><small>Raw data statistics</small></h2>
-                <div id="but-raw" class="btn-group" data-toggle="buttons">
+                <div id="but-raw" class="btn-group" data-toggle="buttons" name="raw-data">
                     <label class="btn btn-primary active">
-                        <input id="but-raw-r1" type="radio" class="btn btn-default" checked>R1
+                        <input id="but-raw-r1" type="radio" class="btn btn-default" name="raw-data" checked>R1
                     </label>
                   <label class="btn btn-primary">
-                      <input id="but-raw-r2" type="radio" class="btn btn-default" checked>R2
+                      <input id="but-raw-r2" type="radio" class="btn btn-default" name="raw-data">R2
                   </label>
                 </div>
                 <div class="row">