diff --git a/Aux/CustomStruct.h b/Aux/CustomStruct.h
new file mode 100644
index 0000000..2e13594
--- /dev/null
+++ b/Aux/CustomStruct.h
@@ -0,0 +1,49 @@
+#ifndef CustomStruct_H
+#define CustomStruct_H
+
+#include <string>
+#include <vector>
+#include <cstdio>
+
+#define ORDERSHIFT 100000
+
+struct FileInfo {
+  std::string fileName;
+  unsigned int fileSize;
+  unsigned int SN;
+  unsigned long hitCount;
+  unsigned short DPPType;
+  unsigned short tick2ns;
+  unsigned short order;
+  unsigned short readerID;
+
+  unsigned long long t0;
+
+  unsigned long ID; // sn + 100000 * order
+
+  void CalOrder(){ ID = ORDERSHIFT * SN + order; }
+
+  void Print(){
+    printf(" %10lu | %3d | %60s | %2d | %6lu | %10u Bytes = %.2f MB\n", 
+            ID, DPPType, fileName.c_str(), tick2ns, hitCount, fileSize, fileSize/1024./1024.);  
+  }
+};
+
+struct GroupInfo{
+
+  std::vector<unsigned short> fileIDList;
+  unsigned int usedHitCount ;
+
+  std::vector<unsigned short> readerIDList;
+  unsigned long hitID ; // this is the ID for the reader->GetHit(hitID);
+
+  unsigned short currentID ; // the ID of the readerIDList;
+  unsigned long hitCount ; // this is the hitCount for the currentID;
+  unsigned int sn;
+  bool finished;
+
+  unsigned long long timeShift; 
+
+};
+
+#endif
\ No newline at end of file
diff --git a/Aux/EventBuilder.cpp b/Aux/EventBuilder.cpp
index da80132..35856b6 100644
--- a/Aux/EventBuilder.cpp
+++ b/Aux/EventBuilder.cpp
@@ -8,6 +8,8 @@
 #include "TFile.h"
 #include "TTree.h"
 
+#include "CustomStruct.h"
+
 #define MAX_MULTI  1000
 
 //^#############################################################
diff --git a/Aux/EventBuilderNoTrace.cpp b/Aux/EventBuilderNoTrace.cpp
index c7ab8f9..f2b8aa5 100644
--- a/Aux/EventBuilderNoTrace.cpp
+++ b/Aux/EventBuilderNoTrace.cpp
@@ -1,4 +1,5 @@
 #include "fsuReader.h"
+#include "CustomStruct.h"
 
 #include "TROOT.h"
 #include "TSystem.h"
diff --git a/Aux/fsuReader.h b/Aux/fsuReader.h
index 60cb086..bbeb97e 100644
--- a/Aux/fsuReader.h
+++ b/Aux/fsuReader.h
@@ -3,47 +3,6 @@
 #include <algorithm>
 #include <filesystem>
 
-#define ORDERSHIFT 100000
-
-struct FileInfo {
-  std::string fileName;
-  unsigned int fileSize;
-  unsigned int SN;
-  unsigned long hitCount;
-  unsigned short DPPType;
-  unsigned short tick2ns;
-  unsigned short order;
-  unsigned short readerID;
-
-  unsigned long long t0;
-
-  unsigned long ID; // sn + 100000 * order
-
-  void CalOrder(){ ID = ORDERSHIFT * SN + order; }
-
-  void Print(){
-    printf(" %10lu | %3d | %60s | %2d | %6lu | %10u Bytes = %.2f MB\n", 
-            ID, DPPType, fileName.c_str(), tick2ns, hitCount, fileSize, fileSize/1024./1024.);  
-  }
-};
-
-struct GroupInfo{
-
-  std::vector<unsigned short> fileIDList;
-  uInt usedHitCount ;
-
-  std::vector<unsigned short> readerIDList;
-  ulong hitID ; // this is the ID for the reader->GetHit(hitID);
-
-  unsigned short currentID ; // the ID of the readerIDList;
-  ulong hitCount ; // this is the hitCount for the currentID;
-  uInt sn;
-  bool finished;
-
-  unsigned long long timeShift; 
-
-};
-
 class FSUReader{
 
   public: