diff --git a/templates/index.html.ep b/templates/index.html.ep
index 9322028..ce38536 100644
--- a/templates/index.html.ep
+++ b/templates/index.html.ep
@@ -2,6 +2,13 @@
 <html>
   <head>
 		<% my $plain_title = $title; $plain_title=~s/<[^>]+>//g; %>
+%# Whether the query was answered at all: not found, and an expression whose
+%# operands cancel each other out, both leave the first list empty.
+% my $have_results = ($lists && @$lists > 0 && $lists->[0] && @{$lists->[0]} > 0);
+%# The count based collocators come out of the co-occurrence database, which is
+%# keyed by one node word, so they have no answer for a query of several
+%# operands. The predictive ones do, see getCollocators().
+% my $single_word = ($operands == 1);
     <title><%= $plain_title  %>:<%= $word %> · IDS word vector analysis</title>
 %# Result pages are computed for one word each and there is one for every
 %# word of the vocabulary, so they are not something to index or to follow.
@@ -44,8 +51,18 @@
      });     
      var urlParams = new URLSearchParams(window.location.search);
      var currentWords = urlParams.get("word");
-     var CIIsearchWords = (currentWords && (currentWords.includes(" ") || currentWords.includes("|")) ? '('+currentWords.replace(/[ |]+/g, " oder ")+')' : currentWords);
+     % use Mojo::ByteStream 'b';
+     // The vocabulary entries the query vector was built from, as the server
+     // resolved them. A query can be a vector expression, "König - Mann +
+     // Frau", and the subtracted operands are deliberately not in here: they
+     // are not marked in the maps, and not part of the KorAP queries built
+     // from the result.
+     var searchedWords = <%= b(Mojo::JSON::to_json($added // '')) %>;
+     var targetWords = " " + searchedWords + " ";
+     var CIIsearchWords = (searchedWords.includes(" ") ? '('+searchedWords.replace(/\s+/g, " oder ")+')' : searchedWords);
      var collocatorTable = null;
+     var classicCollocatorTable = null;
+     var singleWord = <%= $single_word ? 'true' : 'false' %>;
      var plainTitle ="<%= $plain_title %>"  
      var korapPath="/";
      if (plainTitle.match(/-en/)) {
@@ -105,8 +122,8 @@
        var collocatorTable_activated = false;
        $( "#tabs" ).on( "tabsactivate", function( event, ui ) {
          if (localStorage) localStorage['tab'] = ui.newTab.index();
-         if(ui.newTab.index() == 3 && !collocatorTable_activated) {
-           classicCollocatorTable.columns.adjust();
+         if(ui.newTab.index() == 3 && !collocatorTable_activated && collocatorTable) {
+           if (classicCollocatorTable) classicCollocatorTable.columns.adjust();
            collocatorTable.columns.adjust();
            collocatorTable_activated = true;
          }
@@ -143,10 +160,9 @@
          return changeCharColor(str, heat, word);
        }
 
-       % use Mojo::ByteStream 'b';
        var paraResults = <%= b(Mojo::JSON::to_json($lists)) %>;
        var urlprefix =  new URLSearchParams(window.location.search);
-       if (paraResults.length > 0  && paraResults[0] != null) {
+       if (paraResults.length > 0 && paraResults[0] != null && paraResults[0].length > 0) {
          var nvecs = [],
              nwords = [],
              nranks = [],
@@ -157,7 +173,7 @@
            nranks = nranks.concat(paraResults[i].map(function(a){return a.rank;}));
            nmarked = nmarked.concat(paraResults[i].map(function(a){return a.marked;}));
          }
-         showMap({target: " "+urlParams.get('word')+" ", mergedEnd: <%= $mergedEnd %>, words: nwords, vecs: nvecs, ranks: nranks, marked: nmarked} );
+         showMap({target: targetWords, mergedEnd: <%= $mergedEnd %>, words: nwords, vecs: nvecs, ranks: nranks, marked: nmarked} );
          var t = $('#firsttable').DataTable({
            data: [].concat.apply([], paraResults),
            "sScrollY": "780px",
@@ -311,19 +327,24 @@
          var filterQuot = /^quot/;
          var ccResult;
          var baseURL =  window.location.pathname.replace(/[/]$/, '')
-         classicCollocatorTable = makeClassicCollocatorTable('#classicoloctable', baseURL, paraResults[0][0].rank)
+         // Only for a one word query: the node of a count based profile is a
+         // word, and paraResults[0][0] is the nearest word to the query
+         // vector, which is not what was asked for.
+         if (singleWord) {
+           classicCollocatorTable = makeClassicCollocatorTable('#classicoloctable', baseURL, paraResults[0][0].rank)
 
-         $('#show-details').change(function (e) {
-           var columns = classicCollocatorTable.columns(".detail");
-           if(this.checked) {
-             columns.visible(true);
-             $("#ccd").css('width', 'auto');
-           } else {
-             columns.visible(false);
-             $("#ccd").css('width', '680px');
-           }
-           classicCollocatorTable.columns.adjust().draw();
-         } );
+           $('#show-details').change(function (e) {
+             var columns = classicCollocatorTable.columns(".detail");
+             if(this.checked) {
+               columns.visible(true);
+               $("#ccd").css('width', 'auto');
+             } else {
+               columns.visible(false);
+               $("#ccd").css('width', '680px');
+             }
+             classicCollocatorTable.columns.adjust().draw();
+           } );
+         }
 
          $("td.collocator").click(function(){
            queryKorAPCII(this.textContent + " /w1:5,s0 " + CIIsearchWords);
@@ -694,7 +715,7 @@
          $.post(baseURL+'/getVecsByRanks',
                 JSON.stringify(nranks),
                 function(data, status){
-                  showMap({target: " "+urlParams.get('word')+" ", mergedEnd: <%= $mergedEnd %>, words: nwords, vecs: data, ranks: nranks, marked: Array(100).fill(false)} );
+                  showMap({target: targetWords, mergedEnd: <%= $mergedEnd %>, words: nwords, vecs: data, ranks: nranks, marked: Array(100).fill(false)} );
                 }, 'json');
        }
      }
@@ -771,6 +792,12 @@
         </div>
       </div>
     </div>
+    %# Operands that are not in the vocabulary are dropped from the query
+    %# vector, which for an expression like "König - Mannn + Frau" would
+    %# otherwise silently answer a different question.
+    % if($unknown ne '' && $have_results) {
+      <div id="unknownwords"><%= loc 'not_in_vocabulary' %> <span class="mono"><%= $unknown %></span></div>
+    % }
     <div id="topwrapper">
       <div style="visibility: hidden;" id="tabs">
         <ul>
@@ -780,7 +807,11 @@
             % }
             <li><a href="#tabs-1"><%= loc 'paradigmatic_tsne' %></a></li>
             <li><a href="#tabs-2"><%= loc 'paradigmatic_som' %></a></li>
-            <li><a href="#tabs-3"><%= loc 'syntagmatic' %></a></li>
+            %# No syntagmatic tab for a model without a .net file, i.e. without
+            %# the output weights the predictive collocators are read from.
+            % if($collocators) {
+              <li><a href="#tabs-3"><%= loc 'syntagmatic' %></a></li>
+            % }
           % }
           <li><a href="#tabs-4">Info</a></li>
         </ul>
@@ -807,7 +838,7 @@
         </div>
         % }
         <div id="tabs-1" style="display: flex;  padding: 5px; flex-flow: row wrap;">
-          % if($lists && (@$lists) > 0 && (@$lists)[0]) {
+          % if($have_results) {
             <div id="wrapper">
               <div id="first" style="width: 230px; margin-bottom: 15px;">
                 <table class="display compact nowrap" id="firsttable">
@@ -893,6 +924,7 @@
             </div>
           % }
         </div>
+        % if($collocators) {
         <div id="tabs-3" style="display: flex;  padding:5px; flex-flow: row wrap;">
           <div style="margin-right: 20px; margin-bottom: 10px;" id="secondt">
             <table class="display compact nowrap"  id="secondtable">
@@ -928,6 +960,9 @@
               </tbody>
             </table>
           </div>
+          % if(!$single_word) {
+            <div id="ccd" class="notice"><%= loc 'ca_single_word_only' %></div>
+          % } else {
           <div id="ccd" style="">
             <table class="display compact nowrap" id="classicoloctable">
               <thead>
@@ -973,11 +1008,13 @@
               </tbody>
             </table>
           </div>
+          % }
           <!--
                <div style="clear:both" ></div>
                <div style="float: right; overflow: hidden" id="extra"><button onClick="showCollocatorSOM()"> </button></div>
           -->
         </div>
+        % }
         <div id="tabs-4" style="display: flex;  padding:5px; flex-flow: row wrap;">
           <div id="info">
             <h3><%== loc 'about' %></h3>