From c6808d14b4c24c595ded57f9f351bbd1f03c4077 Mon Sep 17 00:00:00 2001
From: Pritam Chakraborty <47203359+prchakra@users.noreply.github.com>
Date: Fri, 16 Jan 2026 11:23:59 +0100
Subject: [PATCH 1/2] FemtoUniverse: Add 3D histogram of kT, pT1, pT2

---
 PWGCF/FemtoUniverse/Core/FemtoUniverseContainer.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/PWGCF/FemtoUniverse/Core/FemtoUniverseContainer.h b/PWGCF/FemtoUniverse/Core/FemtoUniverseContainer.h
index 2db4b16f03e..e482732c291 100644
--- a/PWGCF/FemtoUniverse/Core/FemtoUniverseContainer.h
+++ b/PWGCF/FemtoUniverse/Core/FemtoUniverseContainer.h
@@ -91,6 +91,7 @@ class FemtoUniverseContainer
     if (use3dplots) {
       mHistogramRegistry->add((folderName + "/relPairkstarmTMult").c_str(), ("; " + femtoObs + "; #it{m}_{T} (GeV/#it{c}^{2}); Multiplicity").c_str(), kTH3F, {femtoObsAxis, mTAxis3D, multAxis3D});
       mHistogramRegistry->add((folderName + "/relPairkstarkTMult").c_str(), ("; " + femtoObs + "; #it{k}_{T} (GeV/#it{c}^{2}); Multiplicity").c_str(), kTH3F, {femtoObsAxis, kTAxis, multAxis3D});
+      mHistogramRegistry->add((folderName + "/relPairkTPtPart1PtPart2").c_str(), ("; #it{k}_{T} (GeV/#it{c}^{2}); #it{p}_{T,1} (GeV/#it{c}^{2}); #it{p}_{T,2} (GeV/#it{c}^{2})"), kTH3F, {kTAxis, {375, 0., 7.5}, {375, 0., 7.5}});
     }
   }
 
@@ -200,6 +201,7 @@ class FemtoUniverseContainer
     if (use3dplots) {
       mHistogramRegistry->fill(HIST(FolderSuffix[EventType]) + HIST(o2::aod::femtouniverse_mc_particle::MCTypeName[mc]) + HIST("/relPairkstarmTMult"), femtoObs, mT, mult, weight);
       mHistogramRegistry->fill(HIST(FolderSuffix[EventType]) + HIST(o2::aod::femtouniverse_mc_particle::MCTypeName[mc]) + HIST("/relPairkstarkTMult"), femtoObs, kT, mult, weight);
+      mHistogramRegistry->fill(HIST(FolderSuffix[EventType]) + HIST(o2::aod::femtouniverse_mc_particle::MCTypeName[mc]) + HIST("/relPairkTPtPart1PtPart2"), kT, part1.pt(), part2.pt());    
     }
   }
 

From 20e629ae9cdf21a97a91c088c8eba03560acf0cc Mon Sep 17 00:00:00 2001
From: Pritam Chakraborty <47203359+prchakra@users.noreply.github.com>
Date: Fri, 16 Jan 2026 11:29:22 +0100
Subject: [PATCH 2/2] Fix clang-format error

---
 PWGCF/FemtoUniverse/Core/FemtoUniverseContainer.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/PWGCF/FemtoUniverse/Core/FemtoUniverseContainer.h b/PWGCF/FemtoUniverse/Core/FemtoUniverseContainer.h
index e482732c291..c72e756e062 100644
--- a/PWGCF/FemtoUniverse/Core/FemtoUniverseContainer.h
+++ b/PWGCF/FemtoUniverse/Core/FemtoUniverseContainer.h
@@ -201,7 +201,7 @@ class FemtoUniverseContainer
     if (use3dplots) {
       mHistogramRegistry->fill(HIST(FolderSuffix[EventType]) + HIST(o2::aod::femtouniverse_mc_particle::MCTypeName[mc]) + HIST("/relPairkstarmTMult"), femtoObs, mT, mult, weight);
       mHistogramRegistry->fill(HIST(FolderSuffix[EventType]) + HIST(o2::aod::femtouniverse_mc_particle::MCTypeName[mc]) + HIST("/relPairkstarkTMult"), femtoObs, kT, mult, weight);
-      mHistogramRegistry->fill(HIST(FolderSuffix[EventType]) + HIST(o2::aod::femtouniverse_mc_particle::MCTypeName[mc]) + HIST("/relPairkTPtPart1PtPart2"), kT, part1.pt(), part2.pt());    
+      mHistogramRegistry->fill(HIST(FolderSuffix[EventType]) + HIST(o2::aod::femtouniverse_mc_particle::MCTypeName[mc]) + HIST("/relPairkTPtPart1PtPart2"), kT, part1.pt(), part2.pt());
     }
   }