From bf02fb089c43d33808baef99d2b88c7470557a7e Mon Sep 17 00:00:00 2001
From: Jürgen Knödlseder <jurgen.knodlseder@irap.omp.eu>
Date: Thu, 22 Nov 2018 15:39:48 +0100
Subject: [PATCH] Use counts cube in background cube generation in obsutils.sim() function (#2706)

---
 cscripts/obsutils.py | 5 +++++
 1 file changed, 5 insertions(+), 0 deletions(-)

diff --git a/cscripts/obsutils.py b/cscripts/obsutils.py
index 270d8f5..f775403 100755
--- a/cscripts/obsutils.py
+++ b/cscripts/obsutils.py
@@ -181,6 +181,10 @@ def sim(obs, log=False, debug=False, chatter=2, edisp=False, seed=0,
             # cubes and append them to the observation
             if len(obssim.obs()) > 1:
 
+                # Get counts cube. The counts cube is needed to obtained a
+                # proper background cube.
+                cntcube = binning.cube()
+
                 # Get stacked response (use pointing for map centre)
                 response = get_stacked_response(obssim.obs(), None, None,
                                                 binsz=binsz, nxpix=npix, nypix=npix,
@@ -188,6 +192,7 @@ def sim(obs, log=False, debug=False, chatter=2, edisp=False, seed=0,
                                                 edisp=edisp,
                                                 coordsys=coord, proj=proj,
                                                 addbounds=addbounds,
+                                                cntcube=cntcube,
                                                 log=log, debug=debug,
                                                 chatter=chatter)
 
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