anchor.diff:    <table>
       <thead>
         <tr>
  -        <th class="narrow">Predicted Certainty</th>
  +        <th class="narrow">Confidence</th>
           <%- statistics.each do |stat| -%>
           <th><%= certainty_heading(stat.heading) %></th>
           <%- end -%>
  
positive.code:     </thead>
      <tbody>
        <tr>
          <th class="narrow">Actual Certainty</th>
          <%- statistics.each do |stat| -%>
            <td><%= stat.accuracy %>%</td>
          <%- end -%>
  
negative.code:     </tbody>
    </table>
    <%= image_tag statistics.image_url %>
  </div>
  