[PWGDQ] Updating VtxZ_VtxNcontribReal histogram (#10283)

Co-authored-by: Debadatta3337 <debadatt.behera@cern.ch>

Author: Debadatta3337

PWGDQ/Core/HistogramsLibrary.cxx

@@ -112,6 +112,7 @@ void o2::aod::dqhistograms::DefineHistograms(HistogramManager* hm, const char* h
         hm->AddHistogram(histClass, "VtxZ_MultTPCWithPV", "VtxZ vs MultTPCWithPV", false, 240, -12.0, 12.0, VarManager::kVtxZ, 400, 0, 400.0, VarManager::kMultNTracksHasTPC);
         hm->AddHistogram(histClass, "VtxZ_MultITSTPCWithPV", "VtxZ vs MultITSTPCWithPV", false, 240, -12.0, 12.0, VarManager::kVtxZ, 400, 0, 400.0, VarManager::kMultNTracksITSTPC);
         hm->AddHistogram(histClass, "VtxZ_MultITSOnly", "VtxZ vs MultITSOnly", false, 240, -12.0, 12.0, VarManager::kVtxZ, 400, 0, 400.0, VarManager::kMultNTracksITSOnly);
+        hm->AddHistogram(histClass, "VtxZ_VtxNcontribReal", "VtxZ vs VtxNcontribReal", false, 240, -12.0, 12.0, VarManager::kVtxZ, 200, 0, 200.0, VarManager::kVtxNcontribReal);
 
       } else {
         hm->AddHistogram(histClass, "MultTPC", "MultTPC", false, 200, 0.0, 50000.0, VarManager::kMultTPC);