diff --git a/config/xsd/request/plot.xsd b/config/xsd/request/plot.xsd
index bbe7668..df82164 100644
--- a/config/xsd/request/plot.xsd
+++ b/config/xsd/request/plot.xsd
@@ -869,6 +869,7 @@ Note : This attribute may be unecessary since kind of line may be deduce from Pl
 	<xs:complexType name="ParameterSpectroPropertiesType">
     	<xs:attribute name="yAxis" type="xs:string" />
     	<xs:attribute name="index" type="xs:string" use="optional"></xs:attribute>
+        <xs:attribute name="resolution" type="xs:integer" use="optional"></xs:attribute>
     	<xs:attribute name="min" type="xs:double" use="optional"></xs:attribute>
     	<xs:attribute name="max" type="xs:double" use="optional"></xs:attribute>
         <xs:attribute name="uselog0asmin" type="xs:boolean" use="optional"></xs:attribute>
diff --git a/src/ParamOutputImpl/Plot/SpectroNode.hh b/src/ParamOutputImpl/Plot/SpectroNode.hh
index 4a66685..ce72dbe 100644
--- a/src/ParamOutputImpl/Plot/SpectroNode.hh
+++ b/src/ParamOutputImpl/Plot/SpectroNode.hh
@@ -49,9 +49,16 @@ public:
 		std::shared_ptr<SpectroProperties> spectroPropsPtr =
 				std::shared_ptr<SpectroProperties>(new SpectroProperties(defaultProps));
 
-		// read index definition
 		xmlChar * value = NULL;
 
+		// -- parameter resolution
+		value = xmlGetProp(pNode_, (const xmlChar *) "resolution");
+		if( value ) {
+			spectroPropsPtr->setMaxResolution(atoi((const char*)value));
+			xmlFree(value);
+		}
+
+		// read index definition
 		value = xmlGetProp(pNode_, (const xmlChar*) "index");
 		if (value) {
 			spectroPropsPtr->setIndexDef((const char*) value);
--
libgit2 0.21.2