Re #9013 correct monitor distance

Code/Mantid/instrument/IN16B_Definition.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- For help on the notation used to specify an Instrument Definition File see http://www.mantidproject.org/IDF -->
 <instrument xmlns="http://www.mantidproject.org/IDF/1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.mantidproject.org/IDF/1.0 Schema/IDFSchema.xsd" name="IN16B" valid-from="1900-01-31 23:59:59"
-valid-to="2100-01-31 23:59:59" last-modified="2014-03-21 08:47:08">
+valid-to="2100-01-31 23:59:59" last-modified="2014-03-21 13:10:51">
   <!-- Author: raoul@ill.fr -->
   <defaults>
     <length unit="meter" />
@@ -16,7 +16,7 @@ valid-to="2100-01-31 23:59:59" last-modified="2014-03-21 08:47:08">
   </defaults>
   <!--Moderator -->
   <component type="moderator">
-    <location z="-22" />
+    <location z="-36.41" />
   </component>
   <type name="moderator" is="Source"></type>
   <!--MONITORS-->
@@ -25,7 +25,7 @@ valid-to="2100-01-31 23:59:59" last-modified="2014-03-21 08:47:08">
   </component>
   <type name="monitors">
     <component type="monitor">
-      <location z="-1.200" name="monitor1" />
+      <location z="0.0181" name="monitor1" />
     </component>
   </type>
   <!-- Sample position -->