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diff --git a/src/functors/analytical/indicator/smoothIndicatorCalcF3D.hh b/src/functors/analytical/indicator/smoothIndicatorCalcF3D.hh
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+++ b/src/functors/analytical/indicator/smoothIndicatorCalcF3D.hh
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+/*  This file is part of the OpenLB library
+ *
+ *  Copyright (C) 2014-2016 Mathias J. Krause, Cyril Masquelier, Benjamin Förster, Albert Mink
+ *  E-mail contact: info@openlb.net
+ *  The most recent release of OpenLB can be downloaded at
+ *  <http://www.openlb.net/>
+ *
+ *  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 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, write to the Free
+ *  Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA  02110-1301, USA.
+*/
+
+#ifndef SMOOTH_INDICATOR_CALC_F_3D_HH
+#define SMOOTH_INDICATOR_CALC_F_3D_HH
+
+#include "smoothIndicatorCalcF3D.h"
+
+namespace olb {
+
+
+//////////////////////////////// IndicSmoothCalc3D ////////////////////////////////
+template <typename T, typename S>
+SmoothIndicCalc3D<T, S>::SmoothIndicCalc3D(SmoothIndicatorF3D<T, S>& f, SmoothIndicatorF3D<T, S>& g)
+  : _f(f), _g(g)
+{
+  for ( int i=0; i<3; i++) {
+    this->_myMin[i] = std::min(f.getMin()[i], g.getMin()[i]);
+    this->_myMax[i] = std::max(f.getMax()[i], g.getMax()[i]);
+  }
+  std::swap(f._ptrCalcC, this->_ptrCalcC);
+}
+
+
+template <typename T, typename S>
+SmoothIndicPlus3D<T, S>::SmoothIndicPlus3D(SmoothIndicatorF3D<T, S>& f, SmoothIndicatorF3D<T, S>& g)
+  : SmoothIndicCalc3D<T,S>(f,g)
+{}
+
+// returns 1 if( f==1 || g==1 ) UNION
+template <typename T, typename S>
+bool SmoothIndicPlus3D<T, S>::operator()(T output[], const S input[])
+{
+  this->_f(output, input);
+  T tmp;
+  this->_g(&tmp, input);
+  output[0] = std::max(output[0], tmp);
+  return true;
+}
+
+
+template <typename T, typename S>
+SmoothIndicatorF3D<T, S>& SmoothIndicatorF3D<T, S>::operator+(SmoothIndicatorF3D<T, S>& rhs)
+{
+  auto tmp = std::make_shared< SmoothIndicPlus3D<T,S> >(*this, rhs);
+  this->_ptrCalcC = tmp;
+  return *tmp;
+}
+
+
+} // end namespace olb
+
+#endif