@geometry_profiles.transform_grid<EOL><INDENT>@geometry_profiles.move_grid_to_radial_minimum<EOL>def potential_from_grid(self, grid):<DEDENT>
eta = (<NUM_LIT:1.0> / self.scale_radius) * self.grid_to_grid_radii(grid) + <NUM_LIT><EOL>return np.real(<NUM_LIT> * self.scale_radius * self.kappa_s * self.potential_func_sph(eta))<EOL>
Calculate the potential 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.