From b5c9738d525792c7cd5d32c80218d068eb0b2caf Mon Sep 17 00:00:00 2001
From: Fabian Joswig <fabian.joswig@ed.ac.uk>
Date: Wed, 20 Oct 2021 14:37:46 +0100
Subject: [PATCH] Bug in Zq fixed which altered the momentum of propagators

---
 pyerrors/npr.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pyerrors/npr.py b/pyerrors/npr.py
index a5e79f28..98c99481 100644
--- a/pyerrors/npr.py
+++ b/pyerrors/npr.py
@@ -129,7 +129,7 @@ def _invert_propagator(prop):
 
 def Zq(prop, fermion='Wilson'):
     _check_geometry()
-    mom = prop.mom_in
+    mom = np.copy(prop.mom_in)
     mom[3] /= T / L
     sin_mom = np.sin(2 * np.pi / L * mom)