diff --git a/Grid/qcd/utils/CovariantSmearing.h b/Grid/qcd/utils/CovariantSmearing.h
new file mode 100644
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+++ b/Grid/qcd/utils/CovariantSmearing.h
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+/*************************************************************************************
+
+Grid physics library, www.github.com/paboyle/Grid
+
+Source file: ./lib/qcd/action/scalar/CovariantLaplacian.h
+
+Copyright (C) 2016
+
+Author: Azusa Yamaguchi
+
+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.
+
+See the full license in the file "LICENSE" in the top level distribution
+directory
+*************************************************************************************/
+#pragma once
+
+namespace Grid {
+namespace QCD {
+
+template <class Gimpl> class CovariantSmearing : public Gimpl 
+{
+public:
+  INHERIT_GIMPL_TYPES(Gimpl);
+
+  typedef typename Gimpl::GaugeLinkField GaugeMat;
+  typedef typename Gimpl::GaugeField GaugeLorentz;
+
+  template<typename T>
+  static void GaussianSmear(const std::vector<LatticeColourMatrix>& U, 
+			    T& chi, 
+			    const Real& width, int Iterations, int orthog)
+  {
+    GridBase *grid = chi._grid;
+    T psi(grid);
+
+    ////////////////////////////////////////////////////////////////////////////////////
+    // Follow Chroma conventions for width to keep compatibility with previous data
+    // Free field iterates 
+    //   chi = (1 - w^2/4N p^2)^N chi
+    //
+    //       ~ (e^(-w^2/4N p^2)^N chi
+    //       ~ (e^(-w^2/4 p^2) chi
+    //       ~ (e^(-w'^2/2 p^2) chi          [ w' = w/sqrt(2) ]
+    //
+    // Which in coordinate space is proportional to
+    //
+    //   e^(-x^2/w^2) = e^(-x^2/2w'^2) 
+    //
+    // The 4 is a bit unconventional from Gaussian width perspective, but... it's Chroma convention.
+    // 2nd derivative approx d^2/dx^2  =  x+mu + x-mu - 2x
+    //
+    // d^2/dx^2 = - p^2
+    //
+    // chi = ( 1 + w^2/4N d^2/dx^2 )^N chi
+    //
+    ////////////////////////////////////////////////////////////////////////////////////
+    Real coeff = (width*width) / Real(4*Iterations);
+  
+    int dims = Nd;
+    if( orthog < Nd ) dims=Nd-1;
+
+    for(int n = 0; n < Iterations; ++n) {
+      psi = (-2.0*dims)*chi;
+      for(int mu=0;mu<Nd;mu++) {
+	if ( mu != orthog ) { 
+	  psi = psi + Gimpl::CovShiftForward(U[mu],mu,chi);    
+	  psi = psi + Gimpl::CovShiftBackward(U[mu],mu,chi);    
+	}
+      }
+      chi = chi + coeff*psi;
+    }
+  }
+};
+}}