From 92e44631ad2cd1cad595971f1200b5fb9d2ae877 Mon Sep 17 00:00:00 2001
From: Dmitry Kalinkin <dmitry.kalinkin@gmail.com>
Date: Tue, 5 Nov 2024 20:01:12 -0500
Subject: [PATCH] TrackerMeasurementFromHits: fix time component of covariance

This value is not used yet, but should be squared, in principle.
---
 src/algorithms/tracking/TrackerMeasurementFromHits.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/algorithms/tracking/TrackerMeasurementFromHits.cc b/src/algorithms/tracking/TrackerMeasurementFromHits.cc
index af8d7dfb75..53c429e28f 100644
--- a/src/algorithms/tracking/TrackerMeasurementFromHits.cc
+++ b/src/algorithms/tracking/TrackerMeasurementFromHits.cc
@@ -125,7 +125,7 @@ namespace eicrecon {
             meas2D.setLoc({static_cast<float>(pos[0]),static_cast<float>(pos[1])});                     // 2D location on surface
             meas2D.setTime(hit.getTime());                     // Measurement time
             // fixme: no off-diagonal terms. cov(0,1) = cov(1,0)??
-            meas2D.setCovariance({cov(0,0),cov(1,1),hit.getTimeError(),cov(0,1)}); // Covariance on location and time
+            meas2D.setCovariance({cov(0,0), cov(1,1), hit.getTimeError() * hit.getTimeError(), cov(0,1)}); // Covariance on location and time
             meas2D.addToWeights(1.0);                             // Weight for each of the hits, mirrors hits array
             meas2D.addToHits(hit);
         }