air_potential_temperature / (K)     (scalar cube)
    Scalar coordinates:
        altitude                    418.69836 m, bound=(413.93686, 426.63434) m
        forecast_period             0.0 hours
        grid_latitude               -0.1278 degrees, bound=(-0.12825, -0.12735) degrees
        grid_longitude              359.5796 degrees, bound=(359.57916, 359.58005) degrees
        level_height                5.0 m, bound=(0.0, 13.333332) m
        model_level_number          1
        sigma                       0.9994238, bound=(1.0, 0.99846387)
        surface_altitude            413.93686 m
        time                        2009-09-09 17:10:00
    Attributes:
        source                      'Iris test case'