diff --git a/PARAM_DEF/ulys_el_2d.xml b/PARAM_DEF/ulys_el_2d.xml
index f8e1007..ab993a0 100644
--- a/PARAM_DEF/ulys_el_2d.xml
+++ b/PARAM_DEF/ulys_el_2d.xml
@@ -32,7 +32,7 @@
             </digitalAxis>					
           </yAxis>
           <zAxis>
-            <colorAxis colorMapIndex="1" reverse="false" scale="linear" color="[0,0,0]" thickness="1" showLegend="true" showTickMark="true">
+            <colorAxis colorMapIndex="1" reverse="false" scale="logarithmic" color="[0,0,0]" thickness="1" showLegend="true" showTickMark="true">
               <range extend="true"/>
               <tick position="outwards" minorGrid="false" majorGrid="false"/>
             </colorAxis>
--
libgit2 0.21.2