diff --git a/org/qmckl_jastrow.org b/org/qmckl_jastrow.org
index 3d792f7..121894e 100644
--- a/org/qmckl_jastrow.org
+++ b/org/qmckl_jastrow.org
@@ -1999,10 +1999,10 @@ integer function qmckl_compute_factor_ee_deriv_e_f(context, walk_num, elec_num,
         xinv        = 1.0d0 / (x + 1.0d-18)
         ipar        = 1
 
-        dx(ii) =   ee_distance_rescaled_deriv_e(1, i, j, nw) &
-                 + ee_distance_rescaled_deriv_e(2, i, j, nw) &
-                 + ee_distance_rescaled_deriv_e(3, i, j, nw) &
-                 + ee_distance_rescaled_deriv_e(4, i, j, nw)  
+        dx(1) = ee_distance_rescaled_deriv_e(1, i, j, nw)
+        dx(2) = ee_distance_rescaled_deriv_e(2, i, j, nw)
+        dx(3) = ee_distance_rescaled_deriv_e(3, i, j, nw)
+        dx(4) = ee_distance_rescaled_deriv_e(4, i, j, nw)  
 
         if((i .LE. up_num .AND. j .LE. up_num ) .OR.  &
            (i .GT. up_num .AND. j .GT. up_num)) then