diff --git a/instrument/MERLIN_Definition_2018_03.xml b/instrument/MERLIN_Definition_2018_03.xml
index 9491a9d6f87ed570a90742a33229a634e58ed138..55a5ed81c14261170c5b417c45d1c42e911e16ba 100644
--- a/instrument/MERLIN_Definition_2018_03.xml
+++ b/instrument/MERLIN_Definition_2018_03.xml
@@ -137,10 +137,10 @@
     <component type="monitor">
       <location r="3.25800" t="180.0" p="0.0" />
       <!-- old position was 1.50400-->
-      <location r="1.60900" t="180.0" p="0.0" />
-      <location r="1.60900" t="180.0" p="0.0" />
-      <location r="1.60900" t="180.0" p="0.0" />
-      <location r="1.60900" t="180.0" p="0.0" /> 
+      <location r="1.60800" t="180.0" p="0.0" />
+      <location r="1.60800" t="180.0" p="0.0" />
+      <location r="1.60800" t="180.0" p="0.0" />
+      <location r="1.60800" t="180.0" p="0.0" /> 
       <location r="4.24700" t="0.000" p="0.0" />
       <location r="4.24700" t="0.000" p="0.0" />
       <location r="4.24700" t="0.000" p="0.0" />