diff --git a/sources/core/plugins_manager.cpp b/sources/core/plugins_manager.cpp
index 5d7bec238cf4072227a577a83cf1f7350df689cd..cb11038875591c9d9b21faf2f97b687ca6b9b1cd 100644
--- a/sources/core/plugins_manager.cpp
+++ b/sources/core/plugins_manager.cpp
@@ -94,16 +94,16 @@ function* plugins_manager::get_function() const
 }
 data* plugins_manager::get_data()     const 
 {
-	if(_datas.empty())
+	//if(_datas.empty())
 	{
 		std::cout << "<<DEBUG>>  using vertical segment data loader" << std::endl ;
 		return new vertical_segment() ;
-	}
+	}/*
 	else
 	{
 		std::cout << "<<DEBUG>>  using \"" << _datas.begin()->first << "\" data loader" << std::endl ;
 		return _datas.begin()->second ;
-	}
+	}*/
 }
 fitter* plugins_manager::get_fitter()   const 
 {
diff --git a/sources/core/rational_function.cpp b/sources/core/rational_function.cpp
index 217c3f7caf1069d63898c122068e7f64827635d3..f624eb4beecaf6138a320194e222f18aab59eb21 100644
--- a/sources/core/rational_function.cpp
+++ b/sources/core/rational_function.cpp
@@ -252,7 +252,7 @@ void rational_function::load(const std::string& filename)
 		{
 			continue ;
 		}
-		else
+		else if(j < nY)
 		{
 			int index ; double val ;
 			
@@ -281,13 +281,14 @@ void rational_function::load(const std::string& filename)
 			}
 		}
 	}	
-
+/*
 	for(int i=0; i<a.size(); ++i) {
 		std::cout << a[i] << "\t" ;
 	}
 	for(int i=0; i<b.size(); ++i) {
 		std::cout << b[i] << "\t" ;
 	}
+*/
 }
 void rational_function::save(const std::string& filename, const arguments& args) const
 {