diff --git a/CMakeLists.txt b/CMakeLists.txt
index fabade50..ed6a38d8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,7 +6,7 @@ if (CMAKE_VERSION GREATER_EQUAL "3.3")
   cmake_policy(SET CMP0167 NEW)
 endif ()  
 
-project(musrfit VERSION 1.11.2 LANGUAGES C CXX)
+project(musrfit VERSION 1.11.3 LANGUAGES C CXX)
 
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
diff --git a/ChangeLog b/ChangeLog
index 080ef98f..663c3fbf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -12,6 +12,12 @@ or
 
 https://bitbucket.org/muonspin/musrfit
 
+Release of V1.11.3, 2026/07/15
+==============================
+
+Add Red/Green mode handling for NeXus, especially HDF5 IDF V2. Offset between the 
+routed histograms is 10000 (for LEM it is 20).
+
 Release of V1.11.2, 2026/06/27
 ==============================
 
diff --git a/src/include/PRunDataHandler.h b/src/include/PRunDataHandler.h
index 203beaf7..fa2fa2c8 100644
--- a/src/include/PRunDataHandler.h
+++ b/src/include/PRunDataHandler.h
@@ -865,7 +865,7 @@ Bool_t PRunDataHandler::ReadNexusFileIdf2(T& nxs_file)
 
   // data with its metadata
   if (nxs_file->HasDataset("/raw_data_1/instrument/detector_1/counts")) {
-    int t0_bin{-1}, fgb{-1}, lgb{-1}, noOfHistos{-1}, histoLength{-1};
+    int t0_bin{-1}, fgb{-1}, lgb{-1}, noOfPeriods{-1}, noOfHistos{-1}, histoLength{-1};
     auto count_ds = nxs_file->template GetDataset<int>("/raw_data_1/instrument/detector_1/counts");
     auto count = count_ds.GetData();
     auto dims = count_ds.GetDimensions();
@@ -873,6 +873,7 @@ Bool_t PRunDataHandler::ReadNexusFileIdf2(T& nxs_file)
       std::cerr << std::endl << "**ERROR** PNeXus data dimension error! dims.size()=" << dims.size() << ", expecting == 3." << std::endl;
       return false;
     }
+    noOfPeriods = dims[0];
     noOfHistos = dims[1];
     histoLength = dims[2];
     // get all necessary attributes
@@ -882,24 +883,26 @@ Bool_t PRunDataHandler::ReadNexusFileIdf2(T& nxs_file)
       fgb = std::any_cast<int>(count_ds.GetAttribute("first_good_bin"));
     if (count_ds.HasAttribute("last_good_bin"))
       lgb = std::any_cast<int>(count_ds.GetAttribute("last_good_bin"));
-    if (static_cast<int>(count.size()) != noOfHistos*histoLength) {
-      std::cerr << std::endl << "**ERROR** PNeXus data size error! count.size()=" << count.size() << ", #histos=" << noOfHistos << ", length=" << histoLength << "." << std::endl;
+    if (static_cast<int>(count.size()) != noOfPeriods*noOfHistos*histoLength) {
+      std::cerr << std::endl << "**ERROR** PNeXus data size error! count.size()=" << count.size() << ", #periods=" << noOfPeriods << ", #histos=" << noOfHistos << ", length=" << histoLength << "." << std::endl;
       return false;
     }
 
     // fill dataSet
     PDoubleVector data;
-    for (int i=0; i<noOfHistos; i++) {
-      dataSet.Clear();
-      dataSet.SetHistoNo(i+1); // i.e. histo numbers start with 1
-      dataSet.SetTimeZeroBin(t0_bin);
-      dataSet.SetFirstGoodBin(fgb);
-      dataSet.SetLastGoodBin(lgb);
-      for (int j=0; j<histoLength; j++)
-        data.push_back(count[i*histoLength+j]);
-      dataSet.SetData(data);
-      runData.SetDataSet(dataSet);
-      data.clear();
+    for (int i=0; i<noOfPeriods; i++) {
+      for (int j=0; j<noOfHistos; j++) {
+        dataSet.Clear();
+        dataSet.SetHistoNo(i*10000+j+1); // i.e. histo numbers start with 1
+        dataSet.SetTimeZeroBin(t0_bin);
+        dataSet.SetFirstGoodBin(fgb);
+        dataSet.SetLastGoodBin(lgb);
+        for (int k=0; k<histoLength; k++)
+          data.push_back(count[i*noOfHistos*histoLength+j*histoLength+k]);
+        dataSet.SetData(data);
+        runData.SetDataSet(dataSet);
+        data.clear();
+      }
     }
 
     // keep run name from the msr-file