From 3ef1cdd9f8f7f88d622a73abd3b8b294480ff9bb Mon Sep 17 00:00:00 2001
From: shahoian <ruben.shahoyan@cern.ch>
Date: Sun, 31 May 2026 14:38:25 +0200
Subject: [PATCH] Use full TrackParCov for TPC residuals TrackData.par

---
 .../SpacePoints/include/SpacePoints/TrackInterpolation.h      | 4 ++--
 .../TPC/calibration/SpacePoints/src/SpacePointCalibLinkDef.h  | 2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/Detectors/TPC/calibration/SpacePoints/include/SpacePoints/TrackInterpolation.h b/Detectors/TPC/calibration/SpacePoints/include/SpacePoints/TrackInterpolation.h
index 58627250d815e..71fb51bd8e047 100644
--- a/Detectors/TPC/calibration/SpacePoints/include/SpacePoints/TrackInterpolation.h
+++ b/Detectors/TPC/calibration/SpacePoints/include/SpacePoints/TrackInterpolation.h
@@ -197,7 +197,7 @@ struct TrackDataExtended {
 /// Structure filled for each track with track quality information and a vector with TPCClusterResiduals
 struct TrackData {
   o2::dataformats::GlobalTrackID gid{};      ///< global track ID for seeding track
-  o2::track::TrackPar par{};                 ///< ITS track at inner TPC radius
+  o2::track::TrackParCov par{};              ///< ITS track at inner TPC radius
   float dEdxTPC{};                           ///< TPC dEdx information
   float chi2TPC{};                           ///< chi2 of TPC track
   float chi2ITS{};                           ///< chi2 of ITS track
@@ -226,7 +226,7 @@ struct TrackData {
   }
   float getMultStackPacked(int stack) const { return multStack[stack]; }
 
-  ClassDefNV(TrackData, 10);
+  ClassDefNV(TrackData, 11);
 };
 
 /// \class TrackInterpolation
diff --git a/Detectors/TPC/calibration/SpacePoints/src/SpacePointCalibLinkDef.h b/Detectors/TPC/calibration/SpacePoints/src/SpacePointCalibLinkDef.h
index a3f9f3fe2267c..4703c7ff39fce 100644
--- a/Detectors/TPC/calibration/SpacePoints/src/SpacePointCalibLinkDef.h
+++ b/Detectors/TPC/calibration/SpacePoints/src/SpacePointCalibLinkDef.h
@@ -40,4 +40,6 @@
 #pragma link C++ class o2::conf::ConfigurableParamHelper < o2::tpc::SpacePointsCalibConfParam> + ;
 #pragma link C++ struct o2::tpc::SpacePointsCalibConfParam;
 
+#pragma read sourceClass = "o2::tpc::TrackData" targetClass = "o2::tpc::TrackData" source = "o2::track::TrackPar par" version = "[-10]" target = "par" code = "{}";
+
 #endif