diff --git a/pyext/GResponse.i b/pyext/GResponse.i
index 1991c8e..b8619ad 100644
--- a/pyext/GResponse.i
+++ b/pyext/GResponse.i
@@ -4,10 +4,18 @@
  *  copyright (C) 2008-2011 by Jurgen Knodlseder                           *
  * ----------------------------------------------------------------------- *
  *                                                                         *
- *   This program is free software; you can redistribute it and/or modify  *
- *   it under the terms of the GNU General Public License as published by  *
- *   the Free Software Foundation; either version 2 of the License, or     *
- *   (at your option) any later version.                                   *
+ *  This program is free software: you can redistribute it and/or modify   *
+ *  it under the terms of the GNU General Public License as published by   *
+ *  the Free Software Foundation, either version 3 of the License, or      *
+ *  (at your option) any later version.                                    *
+ *                                                                         *
+ *  This program is distributed in the hope that it will be useful,        *
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of         *
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
+ *  GNU General Public License for more details.                           *
+ *                                                                         *
+ *  You should have received a copy of the GNU General Public License      *
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.  *
  *                                                                         *
  ***************************************************************************/
 /**
diff --git a/src/obs/GResponse.cpp b/src/obs/GResponse.cpp
index 8eec4de..4b2880b 100644
--- a/src/obs/GResponse.cpp
+++ b/src/obs/GResponse.cpp
@@ -271,24 +271,6 @@ double GResponse::irf_diffuse(const GInstDir&            obsDir,
 
 
 /***********************************************************************//**
- * @brief Return maximum IRF radius (in radians)
- *
- * @param[in] srcEng True energy of photon.
- *
- * This method returns the radius beyond which the IRF can be assumed to be
- * zero. By default this method returns pi (hence no limiting IRF radius).
- * Implementing a maximum IRF radius helps the convergence of the Npred
- * integration routine, and brings down computation time to an affordable
- * amount.
- ***************************************************************************/
-double GResponse::irf_max_radius(const GEnergy& srcEng) const
-{
-    // Return pi
-    return pi;
-}
-
-
-/***********************************************************************//**
  * @brief Return data space integral of instrument response function
  *
  * @param[in] model Source model.