table', field: 'v' },
            padding: 5,
            range: 'height'
          }
        ],
        axes: [
          { orient: 'left', scale: 'y' },
          { orient: 'bottom', scale: 'x' },
        ],
        marks: [
          {
            type: 'symbol',
            from: { data: 'table' },
            encode: {
              enter: {
                x: { scale: 'x', field: 'u' },
                y: { scale: 'y', field: 'v' },
                size: { value: 64 },
                fill: { value: '