From 7879406911ead7aeeef899c0815f9836458996a7 Mon Sep 17 00:00:00 2001
From: Johannes Schumann <johannes.schumann@fau.de>
Date: Wed, 9 Dec 2020 10:57:03 +0100
Subject: [PATCH] Fix override problem in pandas df output

---
 km3buu/output.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/km3buu/output.py b/km3buu/output.py
index 9c6835e..69d07a5 100644
--- a/km3buu/output.py
+++ b/km3buu/output.py
@@ -257,9 +257,8 @@ class GiBUUOutput:
         GiBUU output data in pandas dataframe format
         """
         import pandas as pd
-        df = None
         df = awkward1.to_pandas(self.arrays)
-        sec_df = df[df.index.get_level_values(1) == 0]
+        sec_df = df[df.index.get_level_values(1) == 0].copy()
         sec_df.loc[:, "E"] = sec_df.lepOut_E
         sec_df.loc[:, "Px"] = sec_df.lepOut_Px
         sec_df.loc[:, "Py"] = sec_df.lepOut_Py
-- 
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