Protect against out of bounds

Author: ddobrigk

Common/TableProducer/PID/pidTPC.cxx

@@ -435,6 +435,11 @@ struct tpcPid {
     }
 
     float nSigma = -999.f;
+    int multTPC = 0; 
+    if(trk.has_collision()){ 
+      auto collision = collisions.rawIteratorAt(trk.collisionId());
+      multTPC = collision.multTPC(); 
+    }
     float bg = trk.tpcInnerParam() / o2::track::pid_constants::sMasses[pid]; // estimated beta-gamma for network cutoff
     if (useNetworkCorrection && speciesNetworkFlags[pid] && trk.has_collision() && bg > networkBetaGammaCutoff) {
 
@@ -457,7 +462,7 @@ struct tpcPid {
         LOGF(fatal, "Network output-dimensions incompatible!");
       }
     } else {
-      nSigma = response->GetNumberOfSigmaMCTuned(collisions.iteratorAt(trk.collisionId()), trk, pid, tpcSignal);
+      nSigma = response->GetNumberOfSigmaMCTunedAtMultiplicity(multTPC, trk, pid, tpcSignal);
     }
     if (flagFull)
       tableFull(expSigma, nSigma);