code: def deflections_from_grid(self, grid):
          
          return self.grid_to_grid_cartesian(grid=grid,
                                             radius=np.full(grid.shape[0], 2.0 * self.einstein_radius_rescaled))
docs: Calculate the deflection angles at a given set of arc-second gridded coordinates.
  
          Parameters
          ----------
          grid : grids.RegularGrid
              The grid of (y,x) arc-second coordinates the deflection angles are computed on.