galaxies
    model
        redshift                                                                          0.5
        mass
            centre
                centre_0                                                                  GaussianPrior, mean = 0.0, sigma = 0.3
                centre_1                                                                  GaussianPrior, mean = 0.0, sigma = 0.3
            einstein_radius                                                               UniformPrior, lower_limit = 0.0, upper_limit = 4.0
    galaxy
        redshift                                                                          0.5
        light
            centre                                                                        (0.0, 0.0)
            axis_ratio                                                                    1.0
            phi                                                                           0.0
            intensity                                                                     1.0
            effective_radius                                                              0.6
            sersic_index                                                                  4.0
    source
        redshift                                                                          1.0