code: def reciprocal_lattice_from_outcar( filename ): # from https://github.com/MaterialsDiscovery/PyChemia
      
      outcar = open(filename, "r").read()
      # just keeping the last component
      recLat = re.findall(r"reciprocal\s*lattice\s*vectors\s*([-.\s\d]*)",
                          outcar)[-1]
      recLat = recLat.split()
      recLat = np.array(recLat, dtype=float)
      # up to now I have, both direct and rec. lattices (3+3=6 columns)
      recLat.shape = (3, 6)
      recLat = recLat[:, 3:]
      return recLat
docs: Finds and returns the reciprocal lattice vectors, if more than
      one set present, it just returns the last one.
      Args:
          filename (Str): The name of the outcar file to be read
  
      Returns:
          List(Float): The reciprocal lattice vectors.