Fix histo dimension

Author: gbencedi

PWGMM/Mult/Tasks/dndetaMFTPbPb.cxx

@@ -580,8 +580,8 @@ struct DndetaMFTPbPb {
       registryMC.add({"Tracks/NclustersEta", "; nClusters; #eta; occupancy", {HistType::kTHnSparseF, {nclsAxis, etaAxis, occupancyAxis}}});
       registryMC.add({"Events/NotFoundEventZvtx", "; #it{z}_{vtx} (cm); occupancy", {HistType::kTH2F, {zAxis, occupancyAxis}}});
       registryMC.add({"Events/ZvtxDiff", "; Z_{rec} - Z_{gen} (cm); occupancy", {HistType::kTH2F, {deltaZAxis, occupancyAxis}}});
-      registryMC.add({"Events/NgenZvtxSplit", "; N_{gen}; #it{z}_{vtx} (cm); occupancy", {HistType::kTH2F, {multAxis, zAxis, occupancyAxis}}});
-      registryMC.add({"Events/NgenZvtxNoSplit", "; N_{gen}; #it{z}_{vtx} (cm); occupancy", {HistType::kTH2F, {multAxis, zAxis, occupancyAxis}}});
+      registryMC.add({"Events/NgenZvtxSplit", "; N_{gen}; #it{z}_{vtx} (cm); occupancy", {HistType::kTHnSparseF, {multAxis, zAxis, occupancyAxis}}});
+      registryMC.add({"Events/NgenZvtxNoSplit", "; N_{gen}; #it{z}_{vtx} (cm); occupancy", {HistType::kTHnSparseF, {multAxis, zAxis, occupancyAxis}}});
       LOG(info) << "doprocessMc[Best]Inclusive -> Size of the MC histograms:";
       registryMC.print();
     }