diff --git a/algo/evbuild/EventbuildChain.h b/algo/evbuild/EventbuildChain.h
index 7d520feb463c0dbd47f913724a63126a3f44b652..11a3a4a7d32a3191cd028d4de58a909ebb4fbf0a 100644
--- a/algo/evbuild/EventbuildChain.h
+++ b/algo/evbuild/EventbuildChain.h
@@ -39,13 +39,13 @@ namespace cbm::algo
     std::vector<CbmDigiEvent> Run(const CbmDigiTimeslice&);
 
 
-  private:                                                            // members
-    MainConfig fConfig;                                               ///< Configuration / parameters
-    TimeClusterTrigger fTrigger;                                      ///< Trigger algorithm
-    EventBuilder fEventBuilder;                                       ///< Event builder algorithm
+  private:                                                  // members
+    MainConfig fConfig;                                     ///< Configuration / parameters
+    TimeClusterTrigger fTrigger;                            ///< Trigger algorithm
+    EventBuilder fEventBuilder;                             ///< Event builder algorithm
     std::unique_ptr<evbuild::DigiEventSelector> fSelector;  ///< Event selector algorithm
-    qa::DigiEventQa fQa;                                              ///< Event QA algorithm
-    qa::DigiEventQaConfig fQaConfig;                                  ///< Configuration for event QA
+    qa::DigiEventQa fQa;                                    ///< Event QA algorithm
+    qa::DigiEventQaConfig fQaConfig;                        ///< Configuration for event QA
 
 
   private:  // methods
diff --git a/algo/evselector/DigiEventSelector.h b/algo/evselector/DigiEventSelector.h
index e56783cc773ce582234d355940bc8dca6286b37e..28a0a2491d5de73a4ef2ae4e95092aedc76b1fb0 100644
--- a/algo/evselector/DigiEventSelector.h
+++ b/algo/evselector/DigiEventSelector.h
@@ -63,7 +63,7 @@ namespace cbm::algo::evbuild
     bool CheckTofLayers(const std::vector<CbmTofDigi>& digis, size_t minNum) const;
 
 
-  private:                            // members
+  private:                                  // members
     const DigiEventSelectorParams fParams;  ///< Selection parameters
   };
 
diff --git a/core/data/fsd/CbmFsdDigiData.h b/core/data/fsd/CbmFsdDigiData.h
index 0c34eb8c447327853a4f5bac0f3bdfa29b6a2c09..6113de950f2c08f6b3264b89e8be3bd91fc5d54d 100644
--- a/core/data/fsd/CbmFsdDigiData.h
+++ b/core/data/fsd/CbmFsdDigiData.h
@@ -43,6 +43,10 @@ public:
   /** @brief Clear content **/
   void Clear() { fDigis.clear(); }
 
+  /** @brief Size */
+  size_t Size() const { return fDigis.size(); }
+
+
   // --- ROOT serializer
 #ifndef NO_ROOT
   ClassDefNV(CbmFsdDigiData, 1);