code: def compute_deflections_at_next_plane(plane_index, total_planes):
      
  
      if plane_index < total_planes - 1:
          return True
      elif plane_index == total_planes - 1:
          return False
      else:
          raise exc.RayTracingException('A galaxy was not correctly allocated its previous / next redshifts')
docs: This function determines whether the tracer should compute the deflections at the next plane.
  
      This is True if there is another plane after this plane, else it is False..
  
      Parameters
      -----------
      plane_index : int
          The index of the plane we are deciding if we should compute its deflections.
      total_planes : int
          The total number of planes.