Index: trunk/www/dch/quality.php
===================================================================
--- trunk/www/dch/quality.php	(revision 18196)
+++ trunk/www/dch/quality.php	(revision 18257)
@@ -72,4 +72,11 @@
 echo "<br>\n";
 
+echo "SQM: <br>\n ";
+echo "&nbsp;&nbsp;&nbsp;black: magnitudes of the Unihedron SQM-LE, looking
+      close to the FoV of the telescope  <br>\n";
+echo "Magnitudes can be converted to photons per (s sr m^2) as: <br>\n";
+echo "photon flux = 4.4e20 * 10^(-0.4*mag)  <br>\n";
+echo "<br>\n";
+
 echo "</body>\n";
 echo "</html>\n";