diff --git a/image_template.html b/image_template.html
index 1f747aa290745f1470e9ae74f72a7de3ccdb10d9..4a6e16c9e815d40c4d599cf2e480bfd0679ec741 100644
--- a/image_template.html
+++ b/image_template.html
@@ -132,5 +132,10 @@ ${ALTO_ELEMENTS_HTML}
     }});
 </script>
 
+<h2>Full histogram data</h2>
+<pre>
+${GREY_ALL}
+</pre>
+
 </body>
 </html>