Index: trunk/MagicSoft/Mars/datacenter/db/runinfo-aio.php
===================================================================
--- trunk/MagicSoft/Mars/datacenter/db/runinfo-aio.php	(revision 8467)
+++ trunk/MagicSoft/Mars/datacenter/db/runinfo-aio.php	(revision 8768)
@@ -103,5 +103,5 @@
             $query0 .= "RunData.fRunNumber BETWEEN " . $_GET["fRunMin"] . " AND " . $_GET["fRunMax"] . " ";
 
-        if (!empty($_GET["fZDMin"]) && !empty($_GET["fZDMax"]))
+        if ((!empty($_GET["fZDMin"]) || $_GET["fZDMin"]==0) && !empty($_GET["fZDMax"]))
             $query0 .= "AND fZenithDistance BETWEEN " . $_GET["fZDMin"] . " AND  " . $_GET["fZDMax"] . " ";