diff --git a/Detector/DetDriftChamber/compact/det.xml b/Detector/DetDriftChamber/compact/det.xml
index b62dd532d..fb4bffdee 100644
--- a/Detector/DetDriftChamber/compact/det.xml
+++ b/Detector/DetDriftChamber/compact/det.xml
@@ -19,6 +19,8 @@
 
 
   <define>
+    <constant name="tracker_region_rmax" value="1723*mm" />
+    <constant name="tracker_region_zmax" value="3050*mm" />
     <constant name="world_size" value="2226*mm"/>
     <constant name="world_x" value="world_size"/>
     <constant name="world_y" value="world_size"/>
diff --git a/Simulation/DetSimDedx/CMakeLists.txt b/Simulation/DetSimDedx/CMakeLists.txt
index 03bf40d9d..867ff20cd 100644
--- a/Simulation/DetSimDedx/CMakeLists.txt
+++ b/Simulation/DetSimDedx/CMakeLists.txt
@@ -2,7 +2,9 @@
 find_package(Geant4 REQUIRED ui_all vis_all)
 include(${Geant4_USE_FILE})
 find_package(Garfield REQUIRED)
+message(Garfield::Garfield)
 message("libonnxruntime ${OnnxRuntime_LIBRARY}")
+message("libonnxruntime include ${OnnxRuntime_INCLUDE_DIR}")
 find_package(OnnxRuntime REQUIRED)
 
 message("libonnxruntime ${OnnxRuntime_LIBRARY}")
@@ -20,7 +22,8 @@ gaudi_add_module(DetSimDedx
                       EDM4HEP::edm4hep EDM4HEP::edm4hepDict
                       k4FWCore::k4FWCore
                       Garfield::Garfield
-                      ${OnnxRuntime_LIBRARY}
+                      OnnxRuntime
+                      #${OnnxRuntime_LIBRARY}
                       #/cvmfs/sft.cern.ch/lcg/views/LCG_103/x86_64-centos7-gcc11-opt/lib/libonnxruntime.so
                       ${CLHEP_LIBRARIES}
  
diff --git a/Simulation/DetSimDedx/src/TrackHeedSimTool.cpp b/Simulation/DetSimDedx/src/TrackHeedSimTool.cpp
index fb03cefec..3bafda261 100644
--- a/Simulation/DetSimDedx/src/TrackHeedSimTool.cpp
+++ b/Simulation/DetSimDedx/src/TrackHeedSimTool.cpp
@@ -428,9 +428,15 @@ StatusCode TrackHeedSimTool::initialize()
    auto num_input_nodes = m_session->GetInputCount();
    if(m_debug) std::cout << "num_input_nodes: " << num_input_nodes << std::endl;
    for (size_t i = 0; i < num_input_nodes; ++i) {
+      #if (ORT_API_VERSION >=13)
       auto name = m_session->GetInputNameAllocated(i, m_allocator);
       m_inputNodeNameAllocatedStrings.push_back(std::move(name));
       m_input_node_names.push_back(m_inputNodeNameAllocatedStrings.back().get());
+      #else
+      auto name = m_session->GetInputName(i, m_allocator);
+      m_inputNodeNameAllocatedStrings.push_back(name);
+      m_input_node_names.push_back(m_inputNodeNameAllocatedStrings.back());
+      #endif
 
       Ort::TypeInfo type_info  = m_session->GetInputTypeInfo(i);
       auto tensor_info = type_info.GetTensorTypeAndShapeInfo();
@@ -441,7 +447,11 @@ StatusCode TrackHeedSimTool::initialize()
 
 
       if(m_debug) std::cout<< "[" << i << "]"
+      #if (ORT_API_VERSION >=13)
               << " input_name: " << m_inputNodeNameAllocatedStrings.back().get()
+      #else
+              << " input_name: " << m_inputNodeNameAllocatedStrings.back()
+      #endif
               << " ndims: " << dims.size()
               << " dims: " << dims_str(dims)
               << std::endl;
@@ -449,15 +459,25 @@ StatusCode TrackHeedSimTool::initialize()
    // prepare the output
    size_t num_output_nodes = m_session->GetOutputCount();
    for(std::size_t i = 0; i < num_output_nodes; i++) {
+       #if (ORT_API_VERSION >=13)
        auto output_name = m_session->GetOutputNameAllocated(i, m_allocator);
        m_outputNodeNameAllocatedStrings.push_back(std::move(output_name));
        m_output_node_names.push_back(m_outputNodeNameAllocatedStrings.back().get());
+       #else
+       auto output_name = m_session->GetOutputName(i, m_allocator);
+       m_outputNodeNameAllocatedStrings.push_back(output_name);
+       m_output_node_names.push_back(m_outputNodeNameAllocatedStrings.back());
+       #endif
        Ort::TypeInfo type_info        = m_session->GetOutputTypeInfo(i);
        auto tensor_info               = type_info.GetTensorTypeAndShapeInfo();
        ONNXTensorElementDataType type = tensor_info.GetElementType();
        m_output_node_dims               = tensor_info.GetShape();
        if(m_debug) std::cout << "[" << i << "]"
+      #if (ORT_API_VERSION >=13)
                << " output_name: " << m_outputNodeNameAllocatedStrings.back().get()
+      #else
+               << " output_name: " << m_outputNodeNameAllocatedStrings.back()
+      #endif
                << " ndims: " << m_output_node_dims.size()
                << " dims: " << dims_str(m_output_node_dims)
                << std::endl;
diff --git a/Simulation/DetSimDedx/src/TrackHeedSimTool.h b/Simulation/DetSimDedx/src/TrackHeedSimTool.h
index d152fb972..46a9bd89b 100644
--- a/Simulation/DetSimDedx/src/TrackHeedSimTool.h
+++ b/Simulation/DetSimDedx/src/TrackHeedSimTool.h
@@ -39,6 +39,7 @@
 #include <string>
 
 #include "core/session/onnxruntime_cxx_api.h"
+#include "core/session/onnxruntime_c_api.h"
 using namespace Garfield;
 
 class TrackHeedSimTool: public extends<AlgTool, IDedxSimTool> {
@@ -135,9 +136,13 @@ class TrackHeedSimTool: public extends<AlgTool, IDedxSimTool> {
         std::vector<std::vector<int64_t>> m_input_node_dims;
         std::vector<const char*> m_output_node_names;
         std::vector<int64_t> m_output_node_dims;
+        #if (ORT_API_VERSION >=13)
         std::vector<Ort::AllocatedStringPtr> m_inputNodeNameAllocatedStrings;
         std::vector<Ort::AllocatedStringPtr> m_outputNodeNameAllocatedStrings;
-  
+        #else
+        std::vector<const char*> m_inputNodeNameAllocatedStrings;
+        std::vector<const char*> m_outputNodeNameAllocatedStrings;
+        #endif
   
         Gaudi::Property<bool> m_sim_pulse    { this, "sim_pulse"   , true  };
         Gaudi::Property<std::string> m_model_file{ this, "model", "model_test.onnx"};