From b3af3a69acb5f5341332febffd5b0d5a570618f2 Mon Sep 17 00:00:00 2001
From: Daniel Brown <ddb@star.sr.bham.ac.uk>
Date: Wed, 21 Oct 2015 19:45:56 +0100
Subject: [PATCH] fixing deriv_h

---
 pykat/finesse.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pykat/finesse.py b/pykat/finesse.py
index ff1eac5..66f9567 100644
--- a/pykat/finesse.py
+++ b/pykat/finesse.py
@@ -1808,7 +1808,10 @@ class kat(object):
             
         if self.yaxis is not None:
             out.append("yaxis {0}\n".format(self.yaxis))
-         
+        
+        if self.deriv_h is not None:
+            out.append("deriv_h {0}\n".format(self.deriv_h))
+            
         if self.retrace is not None:
             out.append("retrace {0}\n".format(str(self.retrace)))
             
-- 
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