diff --git a/src/ParamOutputImpl/Plot/InstantPlot/InstantSeriesNode.hh b/src/ParamOutputImpl/Plot/InstantPlot/InstantSeriesNode.hh
index 90f29d9..952c583 100644
--- a/src/ParamOutputImpl/Plot/InstantPlot/InstantSeriesNode.hh
+++ b/src/ParamOutputImpl/Plot/InstantPlot/InstantSeriesNode.hh
@@ -90,6 +90,7 @@ protected:
 			((InstantSeriesProperties&) props_).setId(atoi ((const char*)value));
 			xmlFree(value);
 		}
+              
                 
                 		// read index definition
 		value = xmlGetProp(pNode_, (const xmlChar*) "index");
@@ -97,7 +98,6 @@ protected:
 			((InstantSeriesProperties&) props_).setIndexDef((const char*) value);
 			xmlFree(value);
 		}
-                
 	}
 };
 
diff --git a/src/ParamOutputImpl/Plot/SeriesProperties.hh b/src/ParamOutputImpl/Plot/SeriesProperties.hh
index 89669ba..5ad539c 100644
--- a/src/ParamOutputImpl/Plot/SeriesProperties.hh
+++ b/src/ParamOutputImpl/Plot/SeriesProperties.hh
@@ -193,10 +193,13 @@ public:
 
 	std::vector<AMDA::Common::ParameterIndexComponent> getIndexList(std::map<std::string, ParameterData> *pParameterValues);
         
-                	virtual std::string getIndexDef(); 
-
-	virtual void setIndexDef(std::string indexDef);
+          	std::string getIndexDef() const {
+		return _indexDef;
+	}
 
+	void setIndexDef(std::string indexDef) {
+		_indexDef = indexDef;
+	}
 private:
 
 	/**
@@ -255,6 +258,11 @@ private:
 	 * Used for legend axis
 	 */
 	std::string _computeExpressionName;
+        
+                	/**
+	 * @brief Index definition (give by the request)
+	 */
+	std::string _indexDef;
 };
 
 } /* namespace plot */
--
libgit2 0.21.2