diff --git a/PARAM_DEF/mex_h_spec.xml b/PARAM_DEF/mex_h_spec.xml
index 483714b..c581260 100644
--- a/PARAM_DEF/mex_h_spec.xml
+++ b/PARAM_DEF/mex_h_spec.xml
@@ -19,7 +19,7 @@
 			<timePlot>
 				<params>
 					<param id="mex_h_spec_##anode##">
-						<spectro yAxis="y-left"/>
+						<spectro yAxis="y-left" uselog0asmin="true"/>
 					</param>
 				</params> 
 				<axes>
diff --git a/PARAM_DEF/mex_o_spec.xml b/PARAM_DEF/mex_o_spec.xml
index 506395d..15f92a8 100644
--- a/PARAM_DEF/mex_o_spec.xml
+++ b/PARAM_DEF/mex_o_spec.xml
@@ -17,7 +17,7 @@
 			<timePlot>
 				<params>
 					<param id="mex_o_spec_##anode##">
-						<spectro yAxis="y-left"/>
+						<spectro yAxis="y-left" uselog0asmin="true"/>
 					</param>
 				</params> 
 				<axes>
diff --git a/PARAM_DEF/vex_h_spec.xml b/PARAM_DEF/vex_h_spec.xml
index 14c6f81..f89d09d 100644
--- a/PARAM_DEF/vex_h_spec.xml
+++ b/PARAM_DEF/vex_h_spec.xml
@@ -17,7 +17,7 @@
 			<timePlot>
 				<params>
 					<param id="vex_h_spec_##anode##">
-						<spectro yAxis="y-left"/>
+						<spectro yAxis="y-left" uselog0asmin="true"/>
 					</param>
 				</params> 
 				<axes>
diff --git a/PARAM_DEF/vex_o_spec.xml b/PARAM_DEF/vex_o_spec.xml
index af5dc5f..70445e0 100644
--- a/PARAM_DEF/vex_o_spec.xml
+++ b/PARAM_DEF/vex_o_spec.xml
@@ -17,7 +17,7 @@
 			<timePlot>
 				<params>
 					<param id="vex_o_spec_##anode##">
-						<spectro yAxis="y-left"/>
+						<spectro yAxis="y-left" uselog0asmin="true"/>
 					</param>
 				</params> 
 				<axes>
--
libgit2 0.21.2