diff --git a/Bin2Root2.cpp b/Bin2Root2.cpp
index 44c00e8..ee3f1ea 100644
--- a/Bin2Root2.cpp
+++ b/Bin2Root2.cpp
@@ -47,7 +47,7 @@ inline unsigned int getTime_us(){
 
 //^================================================
 ///============ time offset
-std::vector<int64_t> timeOffsetList =  {0, 0, 0, 0};
+std::vector<int64_t> timeOffsetList =  {0, 0, 0, 0}; // in ps
 
 int bufferSize = 5000000;
 
@@ -177,9 +177,12 @@ int ReadBatch(int bufferSize){
 
   }
 
-  // printf("\n");
-  // printf("hitList A : %zu\n", hitList_A.size());
-  // printf("hitList B : %zu\n", hitList_B.size());
+  printf("\n");
+  unsigned long dtA =  (hitList_A.back().TimeStamp - hitList_A.front().TimeStamp)/ 1000;
+  unsigned long dtB =  (hitList_B.back().TimeStamp - hitList_B.front().TimeStamp)/ 1000;
+
+  printf("hitList A | size %zu | timeRange %ld ns = %.3f sec\n", hitList_A.size(), dtA/100, dtA/1e12 );
+  printf("hitList B | size %zu | timeRange %ld ns = %.3f sec\n", hitList_B.size(), dtB/100, dtB/1e12 );
 
   return 1;
 
@@ -324,6 +327,7 @@ int main(int argc, char **argv) {
         if( t0 == -1 ) {
           t0 = hitList_A[i].TimeStamp;
           event.push_back(hitList_A[i]);
+          continue;
         }
 
         if( hitList_A[i].TimeStamp - t0 < timeWindow ){