diff --git a/models/dimers random walk.xml b/models/dimers random walk.xml
index 64d48f4..16439a2 100644
--- a/models/dimers random walk.xml	
+++ b/models/dimers random walk.xml	
@@ -31,7 +31,7 @@
     <!-- loop_on_max="false"  anything moved beyond max is lost-->
                 <axis name="x" size="29"/>
                 <axis name="y" size="0"/>
-                <axis name="z" size="0" loop_on_zero="true" loop_on_max="true"/>
+                <axis name="z" size="0"/>
             </dimension>
             <!-- Site_multiplicity = number of  sites in a space unit. -->
             <!-- Each site points towards a neighbouring space unit. -->