diff --git a/cmake_modules/YamlCpp.cmake b/cmake_modules/YamlCpp.cmake
index a89f5bf2..81f43722 100644
--- a/cmake_modules/YamlCpp.cmake
+++ b/cmake_modules/YamlCpp.cmake
@@ -14,14 +14,12 @@ if (yaml-cpp_BUNDLED)
             PREFIX ${CMAKE_BINARY_DIR}/external/yaml-cpp
     )
 
-
+    execute_process(COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_BINARY_DIR}/external/yaml-cpp/include)
 
     add_library(yaml-cpp SHARED IMPORTED GLOBAL)
-    set_target_properties(yaml-cpp PROPERTIES
-            IMPORTED_LOCATION ${CMAKE_BINARY_DIR}/external/yaml-cpp/lib/libyaml-cpp.so
-            INCLUDE_DIRECTORIES ${CMAKE_BINARY_DIR}/external/yaml-cpp/include
-            )
-    add_dependencies(yaml-cpp yaml-cpp_Ext)
+    set_target_properties(yaml-cpp PROPERTIES IMPORTED_LOCATION ${CMAKE_BINARY_DIR}/external/yaml-cpp/lib/libyaml-cpp.so)
+    target_include_directories(yaml-cpp INTERFACE ${CMAKE_BINARY_DIR}/external/yaml-cpp/include)
+    add_dependencies(yaml-cpp yaml-cpp_Ext yaml-cpp.include)
 
     set(yaml-cpp_FOUND TRUE)
     set(yaml-cpp_INCLUDE_DIR ${CMAKE_BINARY_DIR}/external/yaml-cpp/include)
diff --git a/src/QnAnalysisConfig/CMakeLists.txt b/src/QnAnalysisConfig/CMakeLists.txt
index 17c17c62..15c1e818 100644
--- a/src/QnAnalysisConfig/CMakeLists.txt
+++ b/src/QnAnalysisConfig/CMakeLists.txt
@@ -1,5 +1,3 @@
-find_package(yaml-cpp REQUIRED)
-
 add_library(QnAnalysisConfig STATIC Convert.cpp Config.cpp)
 target_include_directories(QnAnalysisConfig PUBLIC
         $<BUILD_INTERFACE:${QnAnalysis_SOURCE_DIR}>>
diff --git a/src/QnAnalysisCorrelate/CMakeLists.txt b/src/QnAnalysisCorrelate/CMakeLists.txt
index bc95393b..76664075 100644
--- a/src/QnAnalysisCorrelate/CMakeLists.txt
+++ b/src/QnAnalysisCorrelate/CMakeLists.txt
@@ -1,23 +1,30 @@
 
 find_package(Boost REQUIRED COMPONENTS program_options)
-find_package(yaml-cpp REQUIRED)
 
 set(QnAnalysis_SETUPS_DIR ${CMAKE_SOURCE_DIR}/setups)
 
 configure_file(BuildOptions.hpp.in BuildOptions.hpp)
 
+ROOT_GENERATE_DICTIONARY(G__TStringMeta
+        TStringMeta.hpp
+        LINKDEF TStringMetaLinkDef.h
+        OPTIONS -I${CMAKE_CURRENT_SOURCE_DIR})
+add_library(TStringMeta SHARED TStringMeta.cpp G__TStringMeta.cxx)
+target_link_libraries(TStringMeta PUBLIC ROOT::Core)
+target_include_directories(TStringMeta PRIVATE  ${CMAKE_CURRENT_SOURCE_DIR})
+
 add_executable(QnAnalysisCorrelate CorrelationMain.cpp CorrelationTaskRunner.cpp)
 target_link_libraries(QnAnalysisCorrelate
         PRIVATE
         $<$<AND:$<CXX_COMPILER_ID:GNU>,$<VERSION_LESS:$<CXX_COMPILER_VERSION>,9.0>>:stdc++fs>
         PUBLIC
-        QnToolsDataFrame Boost::program_options yaml-cpp)
+        QnToolsDataFrame Boost::program_options yaml-cpp TStringMeta)
 target_include_directories(QnAnalysisCorrelate PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
 
 if (QnAnalysis_BUILD_TESTS)
     include(GoogleTest)
-    add_executable(QnAnalysisCorrelate_UnitTests Config.test.cpp Utils.test.cpp UserCorrelationAction.test.cpp)
-    target_link_libraries(QnAnalysisCorrelate_UnitTests PRIVATE gtest_main yaml-cpp QnToolsDataFrame)
+    add_executable(QnAnalysisCorrelate_UnitTests Config.test.cpp Utils.test.cpp UserCorrelationAction.test.cpp TStringMeta.test.cpp)
+    target_link_libraries(QnAnalysisCorrelate_UnitTests PRIVATE gtest_main yaml-cpp QnToolsDataFrame TStringMeta)
     target_include_directories(QnAnalysisCorrelate_UnitTests PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
     gtest_add_tests(TARGET QnAnalysisCorrelate_UnitTests)
 endif ()
\ No newline at end of file
diff --git a/src/QnAnalysisCorrelate/CorrelationTaskRunner.cpp b/src/QnAnalysisCorrelate/CorrelationTaskRunner.cpp
index 817a5528..aa29e512 100644
--- a/src/QnAnalysisCorrelate/CorrelationTaskRunner.cpp
+++ b/src/QnAnalysisCorrelate/CorrelationTaskRunner.cpp
@@ -15,6 +15,8 @@
 #include <TChain.h>
 #include <TDirectory.h>
 
+#include "Config.hpp"
+
 using std::filesystem::path;
 using std::filesystem::current_path;
 using namespace Qn::Analysis::Correlate;
@@ -51,7 +53,6 @@ void Qn::Analysis::Correlate::CorrelationTaskRunner::Run() {
 
   TFile f(output_file_.c_str(), "RECREATE");
 
-  TObjString container_meta;
   for (auto &task : initialized_tasks_) {
     auto dir = mkcd(task->output_folder, f);
 
@@ -59,10 +60,10 @@ void Qn::Analysis::Correlate::CorrelationTaskRunner::Run() {
       Info(__func__, "Processing '%s'... ", correlation.result_ptr->GetName().c_str());
       auto &container = correlation.result_ptr.GetValue().GetDataContainer();
 
-      container_meta.String() = GenCorrelationMeta(correlation);
+      auto correlation_meta = GenCorrelationMeta(correlation);
 
       dir->WriteObject(&container, correlation.meta_key.c_str());
-      dir->WriteObject(&container_meta, (correlation.meta_key + "_meta").c_str());
+      dir->WriteObject(&correlation_meta, (correlation.meta_key + "_meta").c_str());
     }
   }
 
@@ -219,17 +220,23 @@ TDirectory *CorrelationTaskRunner::mkcd(const path &path, TDirectory& root_dir)
   return pwd;
 }
 
-std::string CorrelationTaskRunner::GenCorrelationMeta(const CorrelationTaskRunner::Correlation &c) {
+TStringMeta CorrelationTaskRunner::GenCorrelationMeta(const CorrelationTaskRunner::Correlation &c) {
   using namespace YAML;
 
   Node n;
   n["meta_key"] = c.meta_key;
-  n["action_name"] = c.action_name;
-  n["argument_names"] = c.argument_names;
+  for (auto &arg : c.args_list) {
+    Node arg_node;
+    arg_node["q-vector"] = arg.q_vector_name;
+    arg_node["correction-step"] = Enum<EQnCorrectionStep>(arg.correction_step);
+    arg_node["component"] = arg.component;
+    arg_node["weight"] = arg.weight;
+    n["args"].push_back(arg_node);
+  }
 
   std::stringstream stream;
   stream << n;
-  return stream.str();
+  return TStringMeta(stream.str());
 }
 
 CorrelationTaskRunner::QVectorComponentFct CorrelationTaskRunner::GetQVectorComponentFct(const CorrelationArg &arg) {
diff --git a/src/QnAnalysisCorrelate/CorrelationTaskRunner.hpp b/src/QnAnalysisCorrelate/CorrelationTaskRunner.hpp
index 87b7de3a..e44c9b7a 100644
--- a/src/QnAnalysisCorrelate/CorrelationTaskRunner.hpp
+++ b/src/QnAnalysisCorrelate/CorrelationTaskRunner.hpp
@@ -14,6 +14,7 @@
 #include <QnDataFrame.hpp>
 #include <TFile.h>
 #include <TTree.h>
+#include <TObjString.h>
 #include <boost/program_options.hpp>
 
 #include <yaml-cpp/yaml.h>
@@ -21,6 +22,8 @@
 #include "Config.hpp"
 #include "Utils.hpp"
 //#include "UserCorrelationAction.hpp"
+#include "TStringMeta.hpp"
+
 
 namespace Qn::Analysis::Correlate {
 
@@ -170,7 +173,7 @@ class CorrelationTaskRunner {
 
   static TDirectory *mkcd(const std::filesystem::path &path, TDirectory &root_dir);
 
-  static std::string GenCorrelationMeta(const Correlation &c);
+  static TStringMeta GenCorrelationMeta(const Correlation &c);
 
   static QVectorComponentFct GetQVectorComponentFct(const CorrelationArg &arg);
 
@@ -216,8 +219,8 @@ class CorrelationTaskRunner {
 
     auto result = std::make_shared<CorrelationTaskInitialized>();
     /* init RDataFrame */
-    auto df = GetRDF();
-    auto df_sampled = Qn::Correlation::Resample(*df, t.n_samples);
+    auto df = GetRDF()->Range(0, 100);
+    auto df_sampled = Qn::Correlation::Resample(df, t.n_samples);
 
     result->output_folder = std::filesystem::path(t.output_folder);
     if (result->output_folder.is_relative()) {
diff --git a/src/QnAnalysisCorrelate/TStringMeta.cpp b/src/QnAnalysisCorrelate/TStringMeta.cpp
new file mode 100644
index 00000000..378a63f8
--- /dev/null
+++ b/src/QnAnalysisCorrelate/TStringMeta.cpp
@@ -0,0 +1,28 @@
+//
+// Created by eugene on 27/10/2020.
+//
+
+#include <iostream>
+#include "TStringMeta.hpp"
+#include <TCollection.h>
+
+ClassImp(TStringMeta)
+
+Bool_t TStringMeta::IsEqual(const TObject *other) const {
+  if (this == other) return kTRUE;
+  if (TStringMeta::Class() != other->IsA()) return false;
+  return TObjString::IsEqual((TObjString*) other);
+}
+
+Long64_t TStringMeta::Merge(TCollection *coll) {
+
+  std::cout << "Merge!" << std::endl;
+  TIter iter(coll);
+  while (TObject *obj = iter()) {
+    if (IsEqual(obj)) { /* do nothing */ }
+    else {
+      return -1;
+    }
+  }
+  return 1l;
+}
diff --git a/src/QnAnalysisCorrelate/TStringMeta.hpp b/src/QnAnalysisCorrelate/TStringMeta.hpp
new file mode 100644
index 00000000..f2af230e
--- /dev/null
+++ b/src/QnAnalysisCorrelate/TStringMeta.hpp
@@ -0,0 +1,24 @@
+//
+// Created by eugene on 27/10/2020.
+//
+
+#ifndef QNANALYSIS_SRC_QNANALYSISCORRELATE_TSTRINGMETA_HPP
+#define QNANALYSIS_SRC_QNANALYSISCORRELATE_TSTRINGMETA_HPP
+
+#include <TObjString.h>
+
+class TStringMeta : public TObjString {
+
+public:
+  TStringMeta() = default;
+  explicit TStringMeta(const std::string& str) : TObjString(str.c_str()) {}
+  explicit TStringMeta(const TObjString& ostr) : TObjString(ostr) {}
+
+
+  Bool_t IsEqual(const TObject *other) const override;
+  Long64_t Merge(TCollection *coll);
+
+  ClassDefOverride(TStringMeta, 1);
+};
+
+#endif //QNANALYSIS_SRC_QNANALYSISCORRELATE_TSTRINGMETA_HPP
diff --git a/src/QnAnalysisCorrelate/TStringMeta.test.cpp b/src/QnAnalysisCorrelate/TStringMeta.test.cpp
new file mode 100644
index 00000000..ff44c503
--- /dev/null
+++ b/src/QnAnalysisCorrelate/TStringMeta.test.cpp
@@ -0,0 +1,32 @@
+//
+// Created by eugene on 27/10/2020.
+//
+
+#include <TFile.h>
+
+#include "TStringMeta.hpp"
+#include <gtest/gtest.h>
+
+
+namespace {
+
+
+TEST(TStringMeta, Same_Meta) {
+
+  TStringMeta s1(std::string("test"));
+  TStringMeta s2(std::string("test"));
+
+  TList l;
+  l.SetOwner(kFALSE);
+  l.Add(&s2);
+
+  s1.Merge(&l);
+
+}
+
+
+
+
+
+}
+
diff --git a/src/QnAnalysisCorrelate/TStringMetaLinkDef.h b/src/QnAnalysisCorrelate/TStringMetaLinkDef.h
new file mode 100644
index 00000000..3ab6eeb2
--- /dev/null
+++ b/src/QnAnalysisCorrelate/TStringMetaLinkDef.h
@@ -0,0 +1,12 @@
+//
+// Created by eugene on 27/10/2020.
+//
+#ifdef __ROOTCLING__
+// turns off dictionary generation for all
+#pragma link off all class;
+#pragma link off all function;
+#pragma link off all global;
+#pragma link off all typedef;
+
+#pragma link C++ class TStringMeta+;
+#endif