From b9e5808515023895957efea0fcfa4f33459a2b78 Mon Sep 17 00:00:00 2001
From: Shunsuke-Kurita <kurita.quark@gmail.com>
Date: Mon, 6 Jul 2026 16:00:41 +0900
Subject: [PATCH] [PWGDQ] Fix e-mu mixed-event histograms being silently empty
 in tableReader_withAssoc fTrackMuonHistNames was stored before the mixing
 histogram names were appended, so PairsEleMuME* classes were never filled.
 Store the names after the ME block, matching the ordering already used in
 dqEfficiency_withAssoc.

---
 PWGDQ/Tasks/tableReader_withAssoc.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/PWGDQ/Tasks/tableReader_withAssoc.cxx b/PWGDQ/Tasks/tableReader_withAssoc.cxx
index 5bef4f617c9..abf0ec8dde2 100644
--- a/PWGDQ/Tasks/tableReader_withAssoc.cxx
+++ b/PWGDQ/Tasks/tableReader_withAssoc.cxx
@@ -1739,7 +1739,6 @@ struct AnalysisSameEventPairing {
             Form("PairsEleMuSEMM_%s_%s", trackCutName.Data(), muonCutName.Data())};
           histNames += Form("%s;%s;%s;", names[0].Data(), names[1].Data(), names[2].Data());
           int index = iTrack * fNCutsMuon + iMuon;
-          fTrackMuonHistNames[index] = names;
 
           if (fEnableBarrelMuonMixingHistos) {
             names.push_back(Form("PairsEleMuMEPM_%s_%s", trackCutName.Data(), muonCutName.Data()));
@@ -1747,6 +1746,7 @@ struct AnalysisSameEventPairing {
             names.push_back(Form("PairsEleMuMEMM_%s_%s", trackCutName.Data(), muonCutName.Data()));
             histNames += Form("%s;%s;%s;", names[3].Data(), names[4].Data(), names[5].Data());
           }
+          fTrackMuonHistNames[index] = names;
 
           if (!cutNamesStr.IsNull()) {
             std::unique_ptr<TObjArray> objArrayPair(cutNamesStr.Tokenize(","));