From a005e5750f906cdc26f568b1569ea455c98d4f12 Mon Sep 17 00:00:00 2001
From: Andreas Suter <andreas.suter@psi.ch>
Date: Mon, 23 Feb 2026 13:02:46 +0100
Subject: [PATCH] fixed an index by one offset issue.

---
 src/classes/PRunBase.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/classes/PRunBase.cpp b/src/classes/PRunBase.cpp
index 8be39ebef..3b51cb10c 100644
--- a/src/classes/PRunBase.cpp
+++ b/src/classes/PRunBase.cpp
@@ -205,7 +205,7 @@ void PRunBase::DeadTimeCorrection(std::vector<PDoubleVector> &histos, PUIntVecto
         Int_t gf = runData->GetNumberOfGoodFrames();
         std::vector<float> t_dt = runData->GetDeadTimeParam();
         for (UInt_t j=0; j<histos[i].size(); j++) {
-          n_true = histos[i][j] / (1.0 - histos[i][j] * t_dt[histoNo[i]] / (gf * fTimeResolution));
+          n_true = histos[i][j] / (1.0 - histos[i][j] * t_dt[histoNo[i]-1] / (gf * fTimeResolution));
           histos[i][j] = n_true;
         }
       }