diff --git a/include/phonons/phononmode.hpp b/include/phonons/phononmode.hpp
index f52b7ab..a5cd052 100644
--- a/include/phonons/phononmode.hpp
+++ b/include/phonons/phononmode.hpp
@@ -128,13 +128,12 @@ class PhononMode {
 
     /**
      * Calculate linear response from ddb 
-     * @param _qpt The Q - Point -> always GAMMA 
      * @param Edir direction vector for electric field in cartesian coordinates 
      * @param Eamp Amplitude of electric field 
      * @param ddb  complete ddb 
      */	
 
-    std::vector<double> lin_res(const geometry::vec3d& _qpt, geometry::vec3d &Edir, double Eamp, const Ddb& ddb); 	
+    std::vector<double> lin_res(const geometry::vec3d &Edir, double Eamp, const Ddb& ddb); 	
 
 };
 
diff --git a/src/phonons/dispdb.cpp b/src/phonons/dispdb.cpp
index 6a22d11..5eb8a71 100644
--- a/src/phonons/dispdb.cpp
+++ b/src/phonons/dispdb.cpp
@@ -324,8 +324,7 @@ void DispDB::loadFromEigParserPhonon(EigParserPhonons& eigparser) {
 void DispDB::linearResponseE(std::vector<double> &Edir, double A, Ddb &ddb) {
   PhononMode respE;
   geometry::vec3d E_dir = {{ Edir[0], Edir[1], Edir[2] }};
-  geometry::vec3d gamma = {{ 0,0,0 }};
-  auto disp_E = respE.lin_res(gamma, E_dir, A, ddb);
+  auto disp_E = respE.lin_res(E_dir, A, ddb);
   _linResE.resize(3*ddb.natom());
   for ( unsigned i = 0 ; i < 3*ddb.natom() ; ++i ) {
     _linResE[i].real(disp_E[i]);
diff --git a/src/phonons/phononmode.cpp b/src/phonons/phononmode.cpp
index 6fd126e..60eca22 100644
--- a/src/phonons/phononmode.cpp
+++ b/src/phonons/phononmode.cpp
@@ -133,10 +133,9 @@ void PhononMode::computeForceCst(const geometry::vec3d& qpt, const Ddb& ddb) {
 
 
 /*Calculate Linear Repsonse of Phonons to a static dielectric field from DFPT*/
-std::vector<double> PhononMode::lin_res(const geometry::vec3d& _qpt, geometry::vec3d &E_vec, double E_Amp, const Ddb& ddb) {
+std::vector<double> PhononMode::lin_res(const geometry::vec3d &E_vec, double E_Amp, const Ddb& ddb) {
 #ifndef HAVE_EIGEN
   throw EXCEPTION("To use this functionnality you need to compile with EIGEN support",ERRABT);
-  (void) _qpt;
   (void) E_vec;
   (void) E_Amp;
   (void) ddb;
@@ -153,16 +152,7 @@ std::vector<double> PhononMode::lin_res(const geometry::vec3d& _qpt, geometry::v
   for ( unsigned iatom = 0 ; iatom < _natom ; ++iatom )
     _zeff[iatom] = ddb.getZeff(iatom); 		/// get BEC-Tensors
 
-	for (unsigned i = 0; i < _zeff.size(); i++) {
-		if (_zeff[i][geometry::mat3dind( 2,1 )] == 0 ){ 
-			  _zeff[i][geometry::mat3dind( 1, 2)] = 0; 
-		}	
-		if (_zeff[i][geometry::mat3dind( 3,1 )] == 0 ){ 
-			  _zeff[i][geometry::mat3dind( 1, 3)] = 0; 
-		}     		
-	} 
-
-	geometry::mat3d rprim = ddb.rprim(); 			/// get rprim
+	const geometry::mat3d rprim = ddb.rprim(); 			/// get rprim
  	 _rprim << rprim[0], rprim[1],rprim[2],
          rprim[3], rprim[4], rprim[5],
          rprim[6], rprim[7], rprim[8];
@@ -182,12 +172,13 @@ std::vector<double> PhononMode::lin_res(const geometry::vec3d& _qpt, geometry::v
 		if (freq_gamma[m] < -1)
 			throw EXCEPTION("NEGATIVE PHONON FREQUENCY FOUND: The linear response to an Electric-Field calculation makes only sense in stable structures. Fully relax your structure",ERRDIV);	
 	}
-        for ( unsigned iatom = 0 ; iatom < _natom ; ++iatom ) {
-            _mass[iatom] = MendeTable.mass[ddb.znucl().at(ddb.typat().at(iatom)-1)]; // type starts at 1
-        }	
-	for ( unsigned i = 0; i < disp_gamma.size(); ++i ) {             
-            disp_gamma[i] = disp_gamma[i].real()*pow(phys::amu_emass,0.5);
-        }
+  _mass.resize(_natom);
+  for ( unsigned iatom = 0 ; iatom < _natom ; ++iatom ) {
+    _mass[iatom] = MendeTable.mass[ddb.znucl().at(ddb.typat().at(iatom)-1)]; // type starts at 1
+  }	
+  for ( unsigned i = 0; i < disp_gamma.size(); ++i ) {             
+    disp_gamma[i] = disp_gamma[i]*sqrt(phys::amu_emass);
+  }
 
 	/*--------- Calculate diplacement under electric filed ---------*/ 
 	/* 1. Calculate polarity of each mode and store*/