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