From f8de4517d04a34a7042120b5db95ffc98fbe2f6e Mon Sep 17 00:00:00 2001
From: Sandro Wenzel <sandro.wenzel@cern.ch>
Date: Wed, 8 Oct 2025 00:37:36 +0200
Subject: [PATCH] Fix one-off index problem when copying collision contexts

Fixing https://its.cern.ch/jira/browse/O2-6437
---
 DataFormats/simulation/src/DigitizationContext.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/DataFormats/simulation/src/DigitizationContext.cxx b/DataFormats/simulation/src/DigitizationContext.cxx
index 9e8a125c06fa4..a157fbc377fde 100644
--- a/DataFormats/simulation/src/DigitizationContext.cxx
+++ b/DataFormats/simulation/src/DigitizationContext.cxx
@@ -708,7 +708,7 @@ DigitizationContext DigitizationContext::extractSingleTimeframe(int timeframeid,
     auto tf_ranges = timeframeindices.at(timeframeid);
 
     auto startindex = std::get<0>(tf_ranges);
-    auto endindex = std::get<1>(tf_ranges);
+    auto endindex = std::get<1>(tf_ranges) + 1; // +1 due to endindex being "including"
     auto earlyindex = std::get<2>(tf_ranges);
 
     if (earlyindex >= 0) {