Reverse changes

Author: Antoniahuber

wakis/gridFIT3D.py

@@ -291,7 +291,7 @@ def _mpi_initialize(self):
             self.Nz += self.n_ghosts
 
         self.z = np.linspace(self.zmin, self.zmax, self.Nz+1)
-        self.dz = np.diff(self.Z) # only uniform grid possible with MPI
+        self.dz = np.diff(self.z) # only uniform grid possible with MPI
 
     def mpi_gather_asGrid(self):
         _grid = None