diff --git a/src/collision_mod.F90 b/src/collision_mod.F90
index 17283101fb9b9bbc418eb5d63036eef729a0fc1b..076792b78d3cc6aeab3935366abda24346c3266a 100644
--- a/src/collision_mod.F90
+++ b/src/collision_mod.F90
@@ -17,133 +17,6 @@ PUBLIC :: apply_COSOlver_mat_e, apply_COSOlver_mat_i
 
 CONTAINS
 
-  ! !******************************************************************************!
-  ! !! Doughtery gyrokinetic collision operator for electrons
-  ! !******************************************************************************!
-  ! SUBROUTINE DoughertyGK(ip_,ij_,ikr_,ikz_,TColl_,specie_)
-  !   IMPLICIT NONE
-  !   INTEGER,     INTENT(IN)        :: ip_,ij_,ikr_,ikz_
-  !   CHARACTER(len = 1), INTENT(IN) :: specie_
-  !   COMPLEX(dp), INTENT(INOUT)     :: TColl_
-  !
-  !   COMPLEX(dp) :: n_,upar_,uperp_,Tpar_, Tperp_
-  !   COMPLEX(dp) :: Dpj, Ppj, T_
-  !   COMPLEX(dp) :: nadiab_moment_0j
-  !   COMPLEX(dp), DIMENSION(:,:), ALLOCATABLE :: moments_
-  !   REAL(dp),    DIMENSION(:),   ALLOCATABLE :: kernel_
-  !   REAL(dp)    :: Knp0, Knp1, Knm1
-  !   INTEGER     :: in_, jmax_
-  !   REAL(dp)    :: n_dp, j_dp, p_dp, b_, bo2_2_, q_tau_, nu_
-  !
-  !   !** Auxiliary variables **
-  !   !! If electrons !!
-  !   IF ( specie_ .EQ. 'e' ) THEN
-  !     p_dp      = REAL(parray_e(ip_),dp)
-  !     j_dp      = REAL(jarray_e(ij_),dp)
-  !     jmax_     = jmaxe
-  !     bo2_2_    = (krarray(ikr_)**2 + kzarray(ikz_)**2) * sigmae2_taue_o2 ! this is (be/2)^2
-  !     b_        = 2_dp*SQRT(bo2_2_) ! this is be
-  !     q_tau_   = q_e/tau_e
-  !     nu_       = nu_ee
-  !     CALL allocate_array(moments_, ips_e,ipe_e, ijs_e,ije_e)
-  !     moments_(ips_e:ipe_e,ijs_e:ije_e) = moments_e(ips_e:ipe_e,ijs_e:ije_e,ikr_,ikz_,updatetlevel)
-  !     CALL allocate_array(kernel_, ijs_e,ije_e)
-  !     kernel_(ijsg_e:ijeg_e)    = kernel_e(ijsg_e:ijeg_e,ikr_,ikz_)
-  !   !! If ions !!
-  !   ELSEIF ( specie_ .EQ. 'i') THEN
-  !     p_dp      = REAL(parray_i(ip_),dp)
-  !     j_dp      = REAL(jarray_i(ij_),dp)
-  !     jmax_     = jmaxi
-  !     bo2_2_    = (krarray(ikr_)**2 + kzarray(ikz_)**2) * sigmai2_taui_o2 ! this is (bi/2)^2
-  !     b_        = 2_dp*SQRT(bo2_2_) ! this is be
-  !     q_tau_   = q_i/tau_i
-  !     nu_       = nu_i
-  !     CALL allocate_array(moments_, ips_i,ipe_i, ijs_i,ije_i)
-  !     moments_(ips_i:ipe_i,ijs_i:ije_i) = moments_i(ips_i:ipe_i,ijs_i:ije_i,ikr_,ikz_,updatetlevel)
-  !     CALL allocate_array(kernel_, ijsg_i,ijeg_i)
-  !     kernel_(ijsg_i:ijeg_i)    = kernel_i(ijsg_i:ijeg_i,ikr_,ikz_)
-  !   ENDIF
-  !
-  !   !** Assembling collison operator **
-  !   ! Velocity-space diffusion (similar to Lenhard Bernstein)
-  !   ! -nuee (p + 2j + b^2/2) Nepj
-  !   TColl_ = -(p_dp + 2._dp*j_dp + 2._dp*bo2_2_)*moments_(ip_,ij_)
-  !
-  !   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Non zero term for p = 0 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-  !   IF( p_dp .EQ. 0 ) THEN ! Kronecker p0
-  !     ! Get adiabatic moment
-  !     TColl_ = TColl_ - (p_dp + 2._dp*j_dp + 2._dp*bo2_2_) * q_tau_ * kernel_(ij_)*phi(ikr_,ikz_)
-  !       !** build required fluid moments **
-  !       n_     = 0._dp
-  !       upar_  = 0._dp; uperp_ = 0._dp
-  !       Tpar_  = 0._dp; Tperp_ = 0._dp
-  !       DO in_ = 1,jmaxe+1
-  !         n_dp = REAL(in_-1,dp)
-  !         ! Store the kernels for sparing readings
-  !         Knp0 =  kernel_(in_)
-  !         Knp1 =  kernel_(in_+1)
-  !         Knm1 =  kernel_(in_-1)
-  !         ! Nonadiabatic moments (only different from moments when p=0)
-  !         nadiab_moment_0j   = moments_(1,in_) + q_tau_ * Knp0 *phi(ikr_,ikz_)
-  !         ! Density
-  !         n_     = n_     + Knp0 * nadiab_moment_0j
-  !         ! Perpendicular velocity
-  !         uperp_ = uperp_ + b_*0.5_dp*(Knp0 - Knm1) * nadiab_moment_0j
-  !         ! Parallel temperature
-  !         Tpar_  = Tpar_  + Knp0 * (SQRT2*moments_(3,in_) + nadiab_moment_0j)
-  !         ! Perpendicular temperature
-  !         Tperp_ = Tperp_ + ((2._dp*n_dp+1._dp)*Knp0 - (n_dp+1._dp)*Knp1 - n_dp*Knm1)*nadiab_moment_0j
-  !       ENDDO
-  !     T_  = (Tpar_ + 2._dp*Tperp_)/3._dp - n_
-  !     ! Add energy restoring term
-  !     TColl_ = TColl_ + T_* 4._dp *  j_dp          * kernel_(ij_)
-  !     TColl_ = TColl_ - T_* 2._dp * (j_dp + 1._dp) * kernel_(ij_+1)
-  !     TColl_ = TColl_ - T_* 2._dp *  j_dp          * kernel_(ij_-1)
-  !     TColl_ = TColl_ + uperp_*b_*  (kernel_(ij_) - kernel_(ij_-1))
-  !   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-  !
-  !   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Non zero term for p = 1 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-  !   ELSEIF( p_dp .eq. 1 ) THEN ! kronecker p1
-  !     !** build required fluid moments **
-  !     upar_  = 0._dp
-  !     DO in_ = 1,jmax_+1
-  !       ! Parallel velocity
-  !        upar_  = upar_  + Kernel_(in_) * moments_(2,in_)
-  !     ENDDO
-  !     TColl_ = TColl_ + upar_*Kernel_(ij_)
-  !   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-  !
-  !   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Non zero term for p = 2 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-  !   ELSEIF( p_dp .eq. 2 ) THEN ! kronecker p2
-  !     !** build required fluid moments **
-  !     n_     = 0._dp
-  !     upar_  = 0._dp; uperp_ = 0._dp
-  !     Tpar_  = 0._dp; Tperp_ = 0._dp
-  !     DO in_ = 1,jmaxe+1
-  !       n_dp = REAL(in_-1,dp)
-  !       ! Store the kernels for sparing readings
-  !       Knp0 =  kernel_(in_)
-  !       Knp1 =  kernel_(in_+1)
-  !       Knm1 =  kernel_(in_-1)
-  !       ! Nonadiabatic moments (only different from moments when p=0)
-  !       nadiab_moment_0j   = moments_(1,in_) + q_tau_*Knp0*phi(ikr_,ikz_)
-  !       ! Density
-  !       n_     = n_     + Knp0 * nadiab_moment_0j
-  !       ! Parallel temperature
-  !       Tpar_  = Tpar_  + Knp0 * (SQRT2*moments_(3,in_) + nadiab_moment_0j)
-  !       ! Perpendicular temperature
-  !       Tperp_ = Tperp_ + ((2._dp*n_dp+1._dp)*Knp0 - (n_dp+1) * Knp1 - n_dp * Knm1)*nadiab_moment_0j
-  !     ENDDO
-  !     T_  = (Tpar_ + 2._dp*Tperp_)/3._dp - n_
-  !     TColl_ = TColl_ + T_*SQRT2*kernel_(ij_)
-  !   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-  !
-  !   ENDIF
-  !   ! Multiply by specieslike collision coefficient
-  !   TColl_ = nu_ * TColl_
-  !
-  ! END SUBROUTINE DoughertyGK
-
   !******************************************************************************!
   !! Doughtery gyrokinetic collision operator for electrons
   !******************************************************************************!